GB1568875A - Creación de Inventos y Patentes con Inteligencia Artificial

GB1568875A – Sweeteners
– Google Patents

GB1568875A – Sweeteners
– Google Patents
Sweeteners

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Publication number
GB1568875A

GB1568875A
GB26313/77A
GB2631377A
GB1568875A
GB 1568875 A
GB1568875 A
GB 1568875A
GB 26313/77 A
GB26313/77 A
GB 26313/77A
GB 2631377 A
GB2631377 A
GB 2631377A
GB 1568875 A
GB1568875 A
GB 1568875A
Authority
GB
United Kingdom
Prior art keywords
sweetener
acetosulphame
range
weight ratio
sodium
Prior art date
1976-06-24
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)

Expired

Application number
GB26313/77A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)

Hoechst AG

Original Assignee
Hoechst AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
1976-06-24
Filing date
1977-06-23
Publication date
1980-06-11

1977-06-23
Application filed by Hoechst AG
filed
Critical
Hoechst AG

1980-06-11
Publication of GB1568875A
publication
Critical
patent/GB1568875A/en

Status
Expired
legal-status
Critical
Current

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Classifications

A—HUMAN NECESSITIES

A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES

A23L—FOODS, FOODSTUFFS, OR NON-ALCOHOLIC BEVERAGES, NOT COVERED BY SUBCLASSES A21D OR A23B-A23J; THEIR PREPARATION OR TREATMENT, e.g. COOKING, MODIFICATION OF NUTRITIVE QUALITIES, PHYSICAL TREATMENT; PRESERVATION OF FOODS OR FOODSTUFFS, IN GENERAL

A23L27/00—Spices; Flavouring agents or condiments; Artificial sweetening agents; Table salts; Dietetic salt substitutes; Preparation or treatment thereof

A23L27/30—Artificial sweetening agents

A23L27/31—Artificial sweetening agents containing amino acids, nucleotides, peptides or derivatives

A23L27/32—Artificial sweetening agents containing amino acids, nucleotides, peptides or derivatives containing dipeptides or derivatives

A—HUMAN NECESSITIES

A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES

A23L27/00—Spices; Flavouring agents or condiments; Artificial sweetening agents; Table salts; Dietetic salt substitutes; Preparation or treatment thereof

A23L27/30—Artificial sweetening agents

Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS

Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC

Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS

Y10S426/00—Food or edible material: processes, compositions, and products

Y10S426/804—Low calorie, low sodium or hypoallergic

Description

PATENT SPECIFICATION ( 11) 1 568 875
U) ( 21) Application No 26313/77 ( 22) Filed 23 Jun 1977 ( 19) ( 31) Convention Application No 2628294 ( 32) Filed 24 Jun 1976 in 2 ( 33) Fed Rep of Germany (DE) M ( 44) Complete Specification Published 11 Jun 1980 tn ( 51) INT CL 3 A 23 L 1/236 ( 52) Index at Acceptance A 2 B 412 660 BCE ( 54) IMPROVEMENTS IN AND RELATING TO SWEETENERS ( 71) We, HOECHST AKTIENGESELLSCHAFT, a body corporate organised according to the laws of the Federal Republic of Germany, of 6230 Frankfurt/Main 80, Postfach 80 03 20, Federal Republic of Germany, do hereby declare the invention for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement:-
Certain artificial sweeteners have a sweetening power which is far higher than that of natural sugars Therefore they may advantageously be used for sweetening, for example, food, beverages, animal feed, pharmaceuticals and cosmetics They have, however, the disadvantage that they have an after-taste when present in high concentration, and in some cases the after-taste is quite strong In addition, the quality of the flavour of artificial 10 sweeteners is different from that of sucrose (which serves as a standard for the evaluation of sweetness) due to the fact that people have become accustomed to sucrose over a long period of time.
For covering this after-taste, a number of various non-sweet additivies, for example maltol, ethyl maltol, citric acid, tartaric acid or quinine sulphate have been added to sweetners (cf 15 German Offenlegungsschrift 2,060,634) These agents have been proposed chiefly for covering the after-taste of saccharin, which has the strongest after-taste of all artifical sweeteners.
Mixtures of sweeteners may be used for the sweetening of food, beverages, animal feed, pharmaceuticals and cosmetics (Cf for example German Auslegeschrift 1,961, 769) The use of sweetener mixtures is often preferred because of the fact that the sweetening power of 20 the individual sweeteners is frequently enhanced synergetically, and thus a smaller quantity may be employed than solely by the use of pure sweeteners.
Another reason why sweetener mixtures are used is the fact that the sweetening effect of some sweeteners is only developed on the tongue after a certain delay, or the sweetening effect sets in very rapidly, and subsequently fades rapidly This disavantage can be substan 25 tially compensated for by adding a sweetener which has a rather long lasting sweetening effect or, if desired, by adding a natural sugar.
An artificial sweetener which has many advantages is acetosulphame, (generic name:
acetosulphame -potassium salt), which is the potassium salt of 3,4dihydro-5-methyl 1,2,3,oxathiazine-4 one-2,2-dioxide Its sweetness is about 80 to 250 times that of saccharose 30 cane or beet sugar) (cf table 1, page 143 of the Journal «Chemie is unserer Zeit», No 5 1975)) The sweetness of this sweetening agent is evolved very rapidly and fades only very slowly The after-taste is insignificant and is perceptible only in rather high concentrations.
Thus acetosulphame may suitably be used alone for the sweetening of food, beverages, pharmaceuticals, cosmetics, toothpaste and animal feed Nevertheless, it is desirable to 35 improve its taste: acetosulphame is very sweet, but the quality of its sweet taste differs from that of saccharose.
Acetosulphame is a potassium salt and, in principle, it could be wholly or in part replaced by other non-toxic water-soluble salts, especially the sodium or calcium salt, of 3,4dihydro-6-methyl 1,2,3-oxathiazine-4 one-2,2-dioxide, but only the calcium salt appears to 40 be of use when compared with the potassium salt.
The invention provides a sweetener which comprises acetosulphame and/or the calcium salt of 3,4-dihydro-6-methyl 1,2,3-oxathiazine-4 one-2,2-dioxide and at least one further artificial sweetner selected from aspartyl peptide esters, sulphamate sweeteners, sulphimide sweetners and dihydrochalcone sweetener 45 2 1,568,875 2 The invention afso provides a method of sweetening a material which comprises adding a sweetener of the invention to the material, which may be, for example, a food, beverage, animal food, pharmaceutical, cosmetic or toothpaste The invention also provides such a material when sweetened by a sweetener of the invention.
The further artificial sweetener is preferably aspartyl phenyalanine methyl ester (an 5 aspartyl peptide ester), a non-toxic water-soluble salt, preferably the sodium or calcium salt, of cyclohexyl sulphamic acid (sulphamate sweeteners), saccharin or one of its non-toxic water-soluble salts, especially its sodium salt (sulphimide sweetener) or neohesperidin or naringine dihydrochalcone or one of their non-toxic water soluble salts (dihydrochalcone sweeteners); non-toxic water-soluble salts are primarily sodium, potassium, ammonium and 10 calcium salts.
One or more further aritifical sweeteners may be used in the mixture with acetosulphame; preferably, however, only one additional sweetener is used.
The acetosulphame and the further artificial sweetener may be present in the sweetener of the invention in any desired proportion; however, they are preferably present in proportions 15 which are inversely proportional to their sweetening powers The sweetening powers are generally determined by comparison with saccharose, for example, in the manner described in the journal «Chemie in unserer Zeit» pages 142-145 ( 1975) The following weight ratios of the sweetener components have been found to be advantageous: acetosulphame/aspartyl phenylalanine methyl ester in the range of from 1:0 to 10:1, especially from 2:5 to 5:2 20 acetosulphame/sodium cyclamate in the range of from 3:1 to 1:12, especially from 1:2 to 1:12 acetosulphame/sodiumsaccharideintherangeoffrom 1:2 to 10:1, especially from 1:1 to 8:1 acetosulphame/neohesperidin-dihydrochalcone in the range of from 5:1 to 20: 1, especially from 8:1 to 15:1 25 The sweetener of the invention has an improved saccharose taste as compared with acetosulphame alone It is extremely surprising that the sweetener of the invention makes it possible to improve just the saccharose-like sweet taste of acetosulphame, since this effect has not been observed or described for mixtures of other sweeteners with one another: by mixing other sweeteners with one another, it has previously only been possible to modify or 30 strengthen or to reduce the after-taste Owing to its special flavour improvement the present invention represents a considerable advance in the field of artificial sweeteners.
The invention will be illustrated by the following Examples.
In each Example, 10 test persons evaluated different sweetener solutions, the sweetness of each of which corresponded to a 6 % by weight saccharose solution Some of the test 35 solutions, taken with closed eyes, contained only the pure sweeteners, others contained a sweetener mixture according to the invention The results obtained are listed in the Examples below.
EXAMPLE 1
The test substance was a mixture of acetosulphame and aspartyl phenylalanine methyl 40 ester The solutions prepared for the test, the sweetness of which corresponded to about 6 % by weight saccharose solutions, contained the following sweetener amounts:
Pure acetosulphame solution 650 mg/l pure aspartyl phenylalanine methyl ester solution 650 mg/I 45 solution of a mixture of acetosulphame and 350 mg/I aspartyl phenylalanine methyl ester in a ratio of 1:1 test result: 50 sacchrose-like taste of the mixture number of evaluations 1) better than that of pure sweetener solutions 16 55 2) equal to that of pure sweetener solutions 1 3) worse than that of pure sweetener solutions 3 The sweet flavour of the solutions of the sweetener mixture is pleasant to the taste for concentrations in the range of from 100 to 800 mg, preferably from 200 to 500 mg, of the 60 mixture per litre.
EXAMPLE 2
A mixture of acetosulphame and sodium cyclamate was tested The solutions prepared for the test contained the following sweetener amounts:
65) pure acetosulphame solution 650 mg/1 pure sodium cyclamate solution 1,750 mg/1 solution of a mixture of acetosulphame and sodium cyclamate in a ratio of 1:5 960 mg/1 5 test result:
saccharose-like taste of the mixture number of evaluations 10 1 better than that of pure sweetener solutions 15 2 equal to that of pure sweetener solutions 3 3 worse than that of pure sweetener solutions 2 The sweetness of the solution of the sweetener mixture is pleasant to the taste for a 15 concentration of the sweetener mixture in the range of from about 300 to 2,500 mg, especially from 600 to 1,800 mg, per litre.
EXAMPLE 3
The test substances was a mixture of acetosulphame and sodium saccharide The solutions prepared for the test contained the following sweetener amounts: 20 pure acetosulphame solution 650 mg/l pure sodium saccharide solution 170 mg/1 solution of the mixture of acetosulphame and sodium saccharide in a ratio of 5:2 410 mg/l 25 test result:
saccharose-like taste of the mixture number of evaluations 1) better than that of pure sweetener solutions 15 2) equal to that of solutions of pure sweeteners 3 3) worse than that of solutions of pure sweeteners 2 The sweetness of the solution of the sweetener mixture is pleasant to the taste for 35 concentration in the range of from 300 to 2,500 mg, especially from 600 to 1,800 mg, per litre.
EXAMPLE 4
The test substance was a mixture of acetosulphame and neohesperidindihydrochalcone.
The solutions prepared for the test contained the following sweetener amounts: 40 pure acetosulphame solution 650 mg/l pure neohesperidin/dihydrochalcone solution 60 mg/1 solution of a mixture consisting of acetosulphame and neohesperidin dihydrochalcone 45 in a ratio of 10:1 115 mg/l test result:
saccharose-like taste of the mixture number of evaluations 50 1) better than that of pure sweetener solution 17 2) equal to that of pure sweetener solutions 3 3) worse than that of pure sweetener solutions 0 5 The sweetness of the solution of the sweetener mixture is pleasant to the taste for concentrations of the sweetener mixture in the range of from 40 to 300 mg, especially from 80 to 200 mg, per litre.
We make no claim herein to the use of a sweetener of the invention which is contrary to the Artificial Sweeteners in Food Regulations of 1817 1969 or which is contrary to the Soft 60 Drinks (Amendment) Regulations of 1818 1969 and subject to this disclaimer.

Claims (1)

WHAT WE CLAIM IS:-
1 A sweetener which comprises acetosulphame and/or the calcium salt of 3, 4dihydro-6-methyl 1,2,3-oxathiazine-4-one-2, 2-dioxide and at least one further artificial sweetener selected from aspartyl peptide esters, sulphamate sweeteners, sulphimide 65 1,568,875 1,568,875 sweeteners and dihydrochalcone sweeteners.
2 A sweetener as claimed in claim 1, which contains aspartyl phenyalanine methyl ester, a non-toxic water-soluble salt of cyclohexyl sulphamic acid, saccharin or a non-toxic watersoluble salt thereof, or neohesperidin or naringine dihydrochalcone or a non-toxic watersoluble salt thereof 5 3 A sweetener as claimed in claim 2, which contains sodium or calcium cyclohexyl sulphamate or sodium sacchride.
4 A sweetener as claimed in any one of claims 1 to 3, wherein the acetosulphame and the further artificial sweetener are present in amounts which are inversely proportional to their respective sweetening powers 10 A sweetener as claimed in claim 1, which comprises acetosulphame and aspartyl phenylalanine methyl ester in a weight ratio in the range of from 1:10 to 10:1.
6 A sweetener as claimed in claim 5, which comprises acetosulphame and aspartyl phenylalanine methyl ester in a weight ratio in the range of from 2:5 to 5:2.
7 A sweetener as claimed in claim 1, which comprises acetosulphame and sodium 15 cyclamate in a weight ratio in the range of from 3:1 to 1:12.
8 A sweetener as claimed in claim 7, which comprises acetosulphame and sodium cyclamate in a weight ratio in the range of from 1:2 to 1:12.
9 A sweetener as claimed in claim 1, which comprises acetosulphame and sodium saccharide in a weight ratio in the range of from 1:2 to 10:1 20 A sweetener as claimed in claim 9, which comprises acetosulphame and sodium saccharide in a weight ratio in the range of from 1:1 to 8:1.
11 A sweetener as claimed in claim 1, which comprises acetosulphame and neohesperidin dihydrochalcone in a weight ratio in the range of from 5:1 to 20:1.
12 A sweetener as claimed in claim 11, which comprises acetosulphame and neohes 25 peridin dihydrochalcone in a weight ratio in the range of from 8:1 to 15:1.
13 A sweetener as claimed in claim 1, substantially as described in any one of the Examples herein.
14 A method of sweetening a material, which comprises adding to the material a sweetener as claimed in any one of claims 1 to 13 30 A method as claimed in claim 14, wherein the material comprises a food, beverage, animal feed, pharmaceutical, cosmetic or toothpaste.
16 A material which has been sweetened by a sweetener as claimed in any one of claims 1 to 13.
17 A food, beverage, animal feed, pharmaceutical, cosmetic or toothpaste which has 35 been sweetened by a sweetener as claimed in any one of claims 1 to 13.
ABEL & IMRAY Chartered Patent Agents, Northumberland House, 303-306 High Holborn, 40 London WC 1 V 7 LH.
Printed for Her Majesty’s Stationery Office, by Croydon Printing Company Limited Croydon Surrey, 1980.
Published by The Patent Office 25 Southampton Buildings, London, WC 2 A l AY from which copies may bhc obtained.

GB26313/77A
1976-06-24
1977-06-23
Sweeteners

Expired

GB1568875A
(en)

Applications Claiming Priority (1)

Application Number
Priority Date
Filing Date
Title

DE2628294A

DE2628294C3
(en)

1976-06-24
1976-06-24

Sweetener blend with improved sucrose-like taste

Publications (1)

Publication Number
Publication Date

GB1568875A
true

GB1568875A
(en)

1980-06-11

Family
ID=5981310
Family Applications (1)

Application Number
Title
Priority Date
Filing Date

GB26313/77A
Expired

GB1568875A
(en)

1976-06-24
1977-06-23
Sweeteners

Country Status (9)

Country
Link

US
(1)

US4158068A
(en)

JP
(1)

JPS5951262B2
(en)

BE
(1)

BE856100A
(en)

CA
(1)

CA1084335A
(en)

CH
(1)

CH627628A5
(en)

DE
(1)

DE2628294C3
(en)

FR
(1)

FR2355461A1
(en)

GB
(1)

GB1568875A
(en)

ZA
(1)

ZA773767B
(en)

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US5334397A
(en)

1992-07-14
1994-08-02
Amurol Products Company
Bubble gum formulation

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1993-11-25
1995-05-31
Zoster, S.A.
New feed for cultured fish

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Tate & Lyle Plc

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Cumberland Packing Corp
Sweetener compositions

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1982-09-03
1983-02-28
Hoechst Ag

PREPARATIONS WITH ACESULFAM WITH IMPROVED TASTE

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1985-01-14

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Pfizer Inc.
Synergistic sweetening compositions

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1983-10-06
1991-02-19

Dietetic frozen desserts containing aspartame

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武田薬品工業株式会社

Dry food manufacturing method

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1985-05-06
1985-09-02
Raffinerie Tirlemontoise Sa

SWEETENING PRODUCT, PROCESS FOR THE MANUFACTURE OF THIS PRODUCT AND PLANT FOR THE IMPLEMENTATION OF THIS PROCESS.

US4959225A
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1988-10-28
1990-09-25
Warner-Lambert Company
Synergistic sweetening compositions containing chlorodeoxysugars and maltitol and methods for preparing same

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1988-10-28
1991-05-07
Warner-Lambert Company
Unpleasant taste masking compositions and methods for preparing same

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1990-07-17
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Wm. Wrigley Jr. Company
Controlled release of dihydrochalcones in chewing gum

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1990-10-31
1991-11-12
Warner-Lamber Company
Encapsulated synergistic sweetening agent compositions comprising aspartame and acesulfame-K and methods for preparing same

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1991-02-26
1995-07-05
Zoster, S.A.
Use of neohesperidin dihydrochalcone for potentiating body and mouthfeel of foods and beverages

US5370864A
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1993-06-29
1994-12-06
The Procter & Gamble Company
Breath protection microcapsules

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1993-06-29
1997-04-15
The Procter & Gamble Company
Beadlets for customization of flavor and sweetener in a beverage

DE4416429A1
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1994-05-10
1995-11-16
Hoechst Ag

Sweetener with an improved sucrose-like taste and process for its production and use

US5641512A
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1995-03-29
1997-06-24
The Procter & Gamble Company
Soft gelatin capsule compositions

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Sweetener salts.

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2004-06-28
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The use of oligosaccharides to increase the sweetness and improve the taste of an acesulfame-k/aspartame mixture

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1998-09-03
Hoechst Ag
Use of oligo:saccharide(s)

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1996-12-20
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Nutrinova Nutrition Specialties&Food Ingredients Gmbh

Method for improving the degree of flavor mixture.

DE19653344C1
(en)

1996-12-20
1998-08-27
Hoechst Ag
Increasing sweetness and enhancing taste of high-intensity sweetener mixtures

US5993882A
(en)

1996-12-20
1999-11-30
Nutrinova, Inc.
Raspberry flavored beverages

US20020037350A1
(en)

1997-03-10
2002-03-28
Shoichi Ishii
Sweetener composition improved in taste

ES2139518B1
(en)

1997-09-16
2000-10-16
Zoster Sa

NEW INSTANT SOLUBILITY SWEETENING COMPOSITIONS IN WATER COMPOSED OF NEOHESPERIDINE DIHIDROCHALCONA WITH ANOTHER OR OTHER HIGH INTENSITY SWEETENERS.

JP3648959B2
(en)

1997-12-22
2005-05-18
味の素株式会社

Sweetener composition

JP3646497B2
(en)

1997-12-22
2005-05-11
味の素株式会社

Granular sweetener

US6730336B2
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1998-01-30
2004-05-04
The Procter & Gamble Co.
Fortified beverages with improved texture and flavor impact at lower dosage of solids

US5976602A
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1998-05-06
1999-11-02
Nutrinova, Inc.
Method of formulating acidified cola beverages and compositions so formulated

US6245373B1
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1998-11-06
2001-06-12
Nutrinova, Inc.
Acidified fruit and iced tea beverages incorporating high intensity sweetener blends

CN1378557A
(en)

1999-10-04
2002-11-06
味之素株式会社
Sweetener compositions with high degree of sweeteness having improved sweeteness, corrigents and utilization thereof

US20030035875A1
(en)

2001-04-03
2003-02-20
Dulebohn Joel I.
Composition for improving the taste and sweetness profile of beverages having intense sweeteners

US20050196503A1
(en)

2004-03-05
2005-09-08
Sunil Srivastava
High-intensity sweetener-polyol compositions

US9101160B2
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2005-11-23
2015-08-11
The Coca-Cola Company
Condiments with high-potency sweetener

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2006-11-02
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The Coca-Cola Company
High-potency sweetener composition with rubisco protein, rubiscolin, rubiscolin derivatives, ace inhibitory peptides, and combinations thereof, and compositions sweetened therewith

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2007-05-22
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The Coca-Cola Company
Sweetness Enhancers, Sweetness Enhanced Sweetener Compositions, Methods for Their Formulation, and Uses

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2010-09-27
2015-12-24
Ｍｃフードスペシャリティーズ株式会社

Citrus flavored acidic tea beverage containing high-intensity sweetener

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Abbott Lab
Calcium cyclamate tablet and process of making the same

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Robert M Horowitz
Dihydrochalcone derivatives and their use as sweetening agents

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1970-01-10
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Hoechst Ag, 6000 Frankfurt

3,4-Dihydro-1,23-oxathiazin-4on-2,2-dioxides, their manufacture and use

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1970-01-12
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Searle & Co
Artificially sweetened consumable products

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Glucose-artificial sweetener mixtures – for prevention of hyperlipemi

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Flavor preservation in chewing gum compositions and candy products

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Sweetening compositions and method for use thereof

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Hoechst Ag, 6000 Frankfurt

3,4-Dihydro-1,2,3-oxathiazin-4-ones and process for their preparation

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(en)

1974-06-10
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Dynapol
Ionic dihydrochalcone sweeteners and food product containing the same

1976

1976-06-24
DE
DE2628294A
patent/DE2628294C3/en
not_active
Expired

1977

1977-06-21
CH
CH759477A
patent/CH627628A5/en
not_active
IP Right Cessation

1977-06-22
US
US05/808,987
patent/US4158068A/en
not_active
Expired – Lifetime

1977-06-23
ZA
ZA00773767A
patent/ZA773767B/en
unknown

1977-06-23
GB
GB26313/77A
patent/GB1568875A/en
not_active
Expired

1977-06-23
JP
JP52073941A
patent/JPS5951262B2/en
not_active
Expired

1977-06-23
CA
CA281,210A
patent/CA1084335A/en
not_active
Expired

1977-06-24
BE
BE178774A
patent/BE856100A/en
not_active
IP Right Cessation

1977-06-24
FR
FR7719415A
patent/FR2355461A1/en
active
Granted

Cited By (2)

* Cited by examiner, † Cited by third party

Publication number
Priority date
Publication date
Assignee
Title

US5334397A
(en)

1992-07-14
1994-08-02
Amurol Products Company
Bubble gum formulation

EP0655203A1
(en)

1993-11-25
1995-05-31
Zoster, S.A.
New feed for cultured fish

Also Published As

Publication number
Publication date

BE856100A
(en)

1977-12-27

DE2628294B2
(en)

1978-04-13

CH627628A5
(en)

1982-01-29

US4158068A
(en)

1979-06-12

FR2355461B1
(en)

1982-11-19

ZA773767B
(en)

1978-05-30

JPS5951262B2
(en)

1984-12-13

FR2355461A1
(en)

1978-01-20

CA1084335A
(en)

1980-08-26

DE2628294C3
(en)

1978-12-14

JPS533571A
(en)

1978-01-13

DE2628294A1
(en)

1977-12-29

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