GB1349400A

GB1349400A – Method of producing porous ceramic bodies
– Google Patents

GB1349400A – Method of producing porous ceramic bodies
– Google Patents
Method of producing porous ceramic bodies

Info

Publication number
GB1349400A

GB1349400A
GB4920371A
GB4920371A
GB1349400A
GB 1349400 A
GB1349400 A
GB 1349400A
GB 4920371 A
GB4920371 A
GB 4920371A
GB 4920371 A
GB4920371 A
GB 4920371A
GB 1349400 A
GB1349400 A
GB 1349400A
Authority
GB
United Kingdom
Prior art keywords
weight
volume
ceramic
plasticiser
polyolefin
Prior art date
1970-10-22
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
GB4920371A
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.)

WR Grace and Co Conn

WR Grace and Co

Original Assignee
WR Grace and Co Conn
WR Grace and Co
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.)
1970-10-22
Filing date
1971-10-22
Publication date
1974-04-03

1971-10-22
Application filed by WR Grace and Co Conn, WR Grace and Co
filed
Critical
WR Grace and Co Conn

1974-04-03
Publication of GB1349400A
publication
Critical
patent/GB1349400A/en

Status
Expired
legal-status
Critical
Current

Links

Espacenet

Global Dossier

Discuss

239000000919
ceramic
Substances

0.000
title
abstract
4

239000003054
catalyst
Substances

0.000
abstract
3

239000004014
plasticizer
Substances

0.000
abstract
3

229920000098
polyolefin
Polymers

0.000
abstract
3

239000000945
filler
Substances

0.000
abstract
2

238000005470
impregnation
Methods

0.000
abstract
2

XPPWAISRWKKERW-UHFFFAOYSA-N
copper palladium
Chemical compound

[Cu].[Pd]
XPPWAISRWKKERW-UHFFFAOYSA-N
0.000
abstract
1

238000000354
decomposition reaction
Methods

0.000
abstract
1

QDOXWKRWXJOMAK-UHFFFAOYSA-N
dichromium trioxide
Chemical compound

O=[Cr]O[Cr]=O
QDOXWKRWXJOMAK-UHFFFAOYSA-N
0.000
abstract
1

238000010304
firing
Methods

0.000
abstract
1

238000010438
heat treatment
Methods

0.000
abstract
1

238000007654
immersion
Methods

0.000
abstract
1

229910052748
manganese
Inorganic materials

0.000
abstract
1

239000011572
manganese
Substances

0.000
abstract
1

230000003647
oxidation
Effects

0.000
abstract
1

238000007254
oxidation reaction
Methods

0.000
abstract
1

229910052763
palladium
Inorganic materials

0.000
abstract
1

KDLHZDBZIXYQEI-UHFFFAOYSA-N
palladium
Substances

[Pd]
KDLHZDBZIXYQEI-UHFFFAOYSA-N
0.000
abstract
1

Classifications

B—PERFORMING OPERATIONS; TRANSPORTING

B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL

B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS

B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts

B01J37/0009—Use of binding agents; Moulding; Pressing; Powdering; Granulating; Addition of materials ameliorating the mechanical properties of the product catalyst

B01J37/0018—Addition of a binding agent or of material, later completely removed among others as result of heat treatment, leaching or washing,(e.g. forming of pores; protective layer, desintegrating by heat)

B—PERFORMING OPERATIONS; TRANSPORTING

B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL

B01D—SEPARATION

B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols

B01D53/34—Chemical or biological purification of waste gases

B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor

B01D53/86—Catalytic processes

B—PERFORMING OPERATIONS; TRANSPORTING

B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL

B01D—SEPARATION

B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols

B01D53/34—Chemical or biological purification of waste gases

B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor

B01D53/86—Catalytic processes

B01D53/8643—Removing mixtures of carbon monoxide or hydrocarbons and nitrogen oxides

B01D53/8646—Simultaneous elimination of the components

B01D53/865—Simultaneous elimination of the components characterised by a specific catalyst

B—PERFORMING OPERATIONS; TRANSPORTING

B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL

B01D—SEPARATION

B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols

B01D53/34—Chemical or biological purification of waste gases

B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor

B01D53/86—Catalytic processes

B01D53/8643—Removing mixtures of carbon monoxide or hydrocarbons and nitrogen oxides

B01D53/8646—Simultaneous elimination of the components

B01D53/8653—Simultaneous elimination of the components characterised by a specific device

B—PERFORMING OPERATIONS; TRANSPORTING

B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL

B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS

B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00

B01J23/70—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper

B01J23/76—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper combined with metals, oxides or hydroxides provided for in groups B01J23/02 – B01J23/36

B01J23/84—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper combined with metals, oxides or hydroxides provided for in groups B01J23/02 – B01J23/36 with arsenic, antimony, bismuth, vanadium, niobium, tantalum, polonium, chromium, molybdenum, tungsten, manganese, technetium or rhenium

B01J23/85—Chromium, molybdenum or tungsten

B01J23/86—Chromium

B01J23/868—Chromium copper and chromium

C—CHEMISTRY; METALLURGY

C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES

C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE

C04B30/00—Compositions for artificial stone, not containing binders

C04B30/02—Compositions for artificial stone, not containing binders containing fibrous materials

C—CHEMISTRY; METALLURGY

C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES

C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE

C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof

C04B38/06—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof by burning-out added substances by burning natural expanding materials or by sublimating or melting out added substances

C04B38/0615—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof by burning-out added substances by burning natural expanding materials or by sublimating or melting out added substances the burned-out substance being a monolitic element having approximately the same dimensions as the final article, e.g. a porous polyurethane sheet or a prepreg obtained by bonding together resin particles

C04B38/062—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof by burning-out added substances by burning natural expanding materials or by sublimating or melting out added substances the burned-out substance being a monolitic element having approximately the same dimensions as the final article, e.g. a porous polyurethane sheet or a prepreg obtained by bonding together resin particles the burned-out substance being formed in situ, e.g. by polymerisation of a prepolymer composition containing ceramic powder

C—CHEMISTRY; METALLURGY

C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON

C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H

C08J2201/00—Foams characterised by the foaming process

C08J2201/04—Foams characterised by the foaming process characterised by the elimination of a liquid or solid component, e.g. precipitation, leaching out, evaporation

C08J2201/054—Precipitating the polymer by adding a non-solvent or a different solvent

C08J2201/0542—Precipitating the polymer by adding a non-solvent or a different solvent from an organic solvent-based polymer composition

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

Y10S502/00—Catalyst, solid sorbent, or support therefor: product or process of making

Y10S502/506—Method of making inorganic composition utilizing organic compound, except formic, acetic, or oxalic acid or salt thereof

Y10S502/507—Synthetic resin, natural resin, polysaccaride, or polypeptide

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

Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

Y10T428/00—Stock material or miscellaneous articles

Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]

Y10T428/24149—Honeycomb-like

Abstract

1349400 Oxidation catalysts W R GRACE & CO 22 Oct 1971 [22 Oct 1970 (3)] 49203/71 Heading B1E [Also in Divisions Cl and F1] A porous, ceramic catalyst support is produced by extracting plasticiser from a homogenious shaped composition comprising 5-67 volume % of a polyolefin having a molecular weight of at least 150,000 and a standard load melt index of substantially zero, 15-18 volume % of a ceramic filler, and 15-18 volume % of a plasticiser heating the polyolefin to remove it as gaseous decomposition products and firing. Example 42 describes impregnation of the porous support with catalyst by immersion in copper-palladium and copper-palladium-manganese solutions, and vacuum impregnation with chromia producing a porous support impregnated with 4.64% by weight Cr 2 O 3 , 6.96 wt % MnO 2 , 4.64 weight % CuO and 0.02 weight % Pd. Examples of plasticisers, ceramic fillers, and polyolefins are given in the Specification.

GB4920371A
1970-10-22
1971-10-22
Method of producing porous ceramic bodies

Expired

GB1349400A
(en)

Applications Claiming Priority (4)

Application Number
Priority Date
Filing Date
Title

US8302070A

1970-10-22
1970-10-22

US8292670A

1970-10-22
1970-10-22

US8291870A

1970-10-22
1970-10-22

US44022074A

1974-02-06
1974-02-06

Publications (1)

Publication Number
Publication Date

GB1349400A
true

GB1349400A
(en)

1974-04-03

Family
ID=27491747
Family Applications (1)

Application Number
Title
Priority Date
Filing Date

GB4920371A
Expired

GB1349400A
(en)

1970-10-22
1971-10-22
Method of producing porous ceramic bodies

Country Status (7)

Country
Link

US
(2)

US3755204A
(en)

BE
(1)

BE774365A
(en)

CA
(3)

CA973691A
(en)

DE
(1)

DE2152498A1
(en)

FR
(1)

FR2113089A5
(en)

GB
(1)

GB1349400A
(en)

NL
(1)

NL7114554A
(en)

Families Citing this family (48)

* Cited by examiner, † Cited by third party

Publication number
Priority date
Publication date
Assignee
Title

GB1412142A
(en)

*

1972-01-14
1975-10-29
Foseco Int
Gas reactors

JPS5137634B2
(en)

*

1972-01-18
1976-10-16

US3963504A
(en)

*

1972-07-05
1976-06-15
W. R. Grace & Co.
Porous ceramic structure

US3953176A
(en)

*

1973-05-22
1976-04-27
Texas Instruments Incorporated
Catalytic converter

GB1491445A
(en)

*

1973-11-08
1977-11-09
Atomic Energy Authority Uk
Catalyst bodies and methods of manufacturing such bodies

US3910850A
(en)

*

1973-12-19
1975-10-07
Grace W R & Co
Contoured monolithic substrate

US3904551A
(en)

*

1973-12-19
1975-09-09
Grace W R & Co
Process for preparing an auto exhaust catalytic converter

US3932310A
(en)

*

1974-03-07
1976-01-13
W. R. Grace & Co.
Reduction firing of ceramics composited with organic binders

US3983283A
(en)

*

1974-03-18
1976-09-28
Corning Glass Works
Honeycombed structures having open-ended cells formed by interconnected walls with longitudinally extending discontinuities

JPS5144913B2
(en)

*

1974-10-03
1976-12-01

US3985846A
(en)

*

1975-04-16
1976-10-12
W. R. Grace & Co.
Ceramic firing process

US4054702A
(en)

*

1976-03-05
1977-10-18
W. R. Grace & Co.
Monolith design

JPS5351327A
(en)

*

1976-10-20
1978-05-10
Matsushita Electric Ind Co Ltd
Catalytic type exhaust purifier

DE2953867A1
(en)

*

1979-10-03
1982-02-04
Acurex Corp

CATALYST COMPOSITIONS, THEIR METHOD OF FORMULATION AND COMBUSTION PROCESSES USING THE CATALYST COMPOSITIONS

US4337028A
(en)

*

1980-05-27
1982-06-29
The United States Of America As Represented By The United States Environmental Protection Agency
Catalytic monolith, method of its formulation and combustion process using the catalytic monolith

US4628042A
(en)

*

1983-06-20
1986-12-09
Engelhard Corporation
Porous mullite

JPS6078707A
(en)

*

1983-10-07
1985-05-04
日本碍子株式会社
Ceramic honeycomb structure and manufacture thereof and rotary heat accumulation type ceramic heat exchange body utilizing said structure and extrusion molding die for said heat exchange body

JPH0643140Y2
(en)

*

1985-03-05
1994-11-09
株式会社ブリヂストン

Breathable insulation

DE3521766A1
(en)

*

1985-06-19
1987-01-02
Basf Ag

HONEYCOMB CATALYST, ITS PRODUCTION AND USE

US4716064A
(en)

*

1985-10-31
1987-12-29
Air Products And Chemicals, Inc.
Composite stiff lightweight structure and method for making same

US4902216A
(en)

*

1987-09-08
1990-02-20
Corning Incorporated
Extrusion die for protrusion and/or high cell density ceramic honeycomb structures

US5028650A
(en)

*

1988-01-27
1991-07-02
W. R. Grace & Co.-Conn.
Boron nitride sheets

US4920640A
(en)

*

1988-01-27
1990-05-01
W. R. Grace & Co.-Conn.
Hot pressing dense ceramic sheets for electronic substrates and for multilayer electronic substrates

JP2581774B2
(en)

*

1988-07-28
1997-02-12
日本碍子株式会社

Ceramic honeycomb structure and method of manufacturing the same

US5149475A
(en)

*

1988-07-28
1992-09-22
Ngk Insulators, Ltd.
Method of producing a honeycomb structure

WO1990002603A1
(en)

*

1988-09-02
1990-03-22
Gebrüder Sulzer Aktiengesellschaft
Device for carrying out catalytic reactions

JPH02279569A
(en)

*

1989-03-10
1990-11-15
W R Grace & Co
Boron nitride sheet

IT1232749B
(en)

*

1989-04-12
1992-03-05
I R T I Istituto Di Ricerca E

EXHAUST GAS PURIFIER WITH CATALYTIC ACTIVITY AND SILENCER FOR INTERNAL COMBUSTION ENGINES

JP2818473B2
(en)

*

1990-06-29
1998-10-30
日本碍子株式会社

Catalytic converter for automotive exhaust gas purification and automotive exhaust gas purification method

US5229080A
(en)

*

1990-06-29
1993-07-20
Ngk Insulators, Ltd.
Resistance adjusting type heater and catalytic converter

US5229079A
(en)

*

1990-06-29
1993-07-20
Ngk Insulators, Ltd.
Catalytic converter for use in automotive exhaust emission control

US5234668A
(en)

*

1990-07-25
1993-08-10
Ngk Insulators, Ltd.
Catalytic converter for use in automotive exhaust emissions control

US5660778A
(en)

*

1995-06-26
1997-08-26
Corning Incorporated
Method of making a cross-flow honeycomb structure

DK0761938T3
(en)

*

1995-08-30
2002-07-22
Haldor Topsoe As

Process and catalyst unit for treating exhaust gas from diesel engine

DE19533486A1
(en)

*

1995-09-12
1997-03-13
Basf Ag

Monomodal and polymodal catalyst supports and catalysts with narrow pore size distributions and their manufacturing processes

DE19533484A1
(en)

*

1995-09-12
1997-03-13
Basf Ag

Monomodal and polymodal catalyst supports and catalysts with narrow pore size distributions and their manufacturing processes

US5897915A
(en)

*

1996-10-28
1999-04-27
Corning Incorporated
Coated substrates, method for producing same, and use therefor

US6311485B1
(en)

*

1997-08-22
2001-11-06
Deutsches Zentrum Fuer
Gas exhaust system

BR9812402A
(en)

*

1997-10-03
2000-09-19
Corning Inc

Method for burning ceramic alveolar bodies

US6544589B2
(en)

2001-08-20
2003-04-08
Northrop Grumman Corporation
Method of controlling drying stresses by restricting shrinkage of ceramic coating

US7141204B2
(en)

*

2002-12-18
2006-11-28
Corning Incorporated
Method of forming ceramic articles

JP4161948B2
(en)

*

2004-08-23
2008-10-08
トヨタ自動車株式会社

Heat generation system and heat supply method

US8318627B2
(en)

*

2005-08-10
2012-11-27
Sd Lizenzverwertungsgesellschaft Mbh & Co. Kg
Process for preparation of a catalyst carrier

WO2007096986A1
(en)

*

2006-02-24
2007-08-30
Ibiden Co., Ltd.
End face heating apparatus, method of drying end face of honeycomb assembly, and process for producing honeycomb structure

US8257659B2
(en)

2007-07-02
2012-09-04
Cummins Filtration Ip, Inc.
Prevention of face-plugging on aftertreatment devices in exhaust

US9566562B1
(en)

*

2012-08-21
2017-02-14
Superior Technical Ceramics Corporation
High-temperature open-cell porous ceramic

JP5735046B2
(en)

*

2013-06-18
2015-06-17
コバレントマテリアル株式会社

Insulation

US9938195B2
(en)

*

2014-06-24
2018-04-10
Coorstek Kk
Heat insulating material containing a porous sintered body formed of MgAl2O4

Family Cites Families (7)

* Cited by examiner, † Cited by third party

Publication number
Priority date
Publication date
Assignee
Title

US3125618A
(en)

*

1964-03-17

Method of molding and a ceramic binder formulation

GB1006518A
(en)

*

1963-03-21
1965-10-06
Doulton & Co Ltd
Improvements in or relating to moulding ceramic material

US3362783A
(en)

*

1963-12-23
1968-01-09
Texaco Inc
Treatment of exhaust gases

US3377269A
(en)

*

1964-06-15
1968-04-09
Universal Oil Prod Co
Oxidation catalyst comprising variable density activator

US3437605A
(en)

*

1965-01-26
1969-04-08
Engelhard Ind Inc
Method of preparing a supported catalyst

DE1517993A1
(en)

*

1965-10-29
1969-02-13
Heinz Berger

Process for the manufacture of catalysts

US3467602A
(en)

*

1966-10-24
1969-09-16
Air Prod & Chem
Preparing porous refractory oxides by adding and removing polypropylene microspheres

1970

1970-10-22
US
US00082918A
patent/US3755204A/en
not_active
Expired – Lifetime

1971

1971-09-28
CA
CA123,868A
patent/CA973691A/en
not_active
Expired

1971-09-28
CA
CA123,870A
patent/CA973692A/en
not_active
Expired

1971-09-28
CA
CA123,869A
patent/CA972344A/en
not_active
Expired

1971-10-21
DE
DE19712152498
patent/DE2152498A1/en
active
Pending

1971-10-21
FR
FR7137928A
patent/FR2113089A5/fr
not_active
Expired

1971-10-22
GB
GB4920371A
patent/GB1349400A/en
not_active
Expired

1971-10-22
BE
BE774365A
patent/BE774365A/en
unknown

1971-10-22
NL
NL7114554A
patent/NL7114554A/xx
unknown

1974

1974-02-06
US
US28195D
patent/USRE28195E/en
not_active
Expired

Also Published As

Publication number
Publication date

DE2152498A1
(en)

1972-05-25

USRE28195E
(en)

1974-10-08

NL7114554A
(en)

1972-04-25

CA973692A
(en)

1975-09-02

FR2113089A5
(en)

1972-06-23

CA972344A
(en)

1975-08-05

BE774365A
(en)

1972-02-14

US3755204A
(en)

1973-08-28

CA973691A
(en)

1975-09-02

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(en)

1964-03-16

Procedure for the production of high molecular weight polymers (Machine-translation by Google Translate, not legally binding)

GB1524886A
(en)

1978-09-13

Alumina based catalyst-sorbent system

YU81274A
(en)

1981-02-28

Process for the preparatinon of a catalyst for the reaction of ethylene, oxygen or oxygen containing gases, and carboxylic acids into vinyl esters

GB1534047A
(en)

1978-11-29

Catalyst suitable for oxidising the harmful constituents of engine exhaust gases

JPS5631443A
(en)

1981-03-30

Organic metal complex group hydrogen containing catalyst

GB1521408A
(en)

1978-08-16

Tool-electrode for spark erosion machining

DE2012529B2
(en)

1973-07-05

PROCESS FOR THE PRODUCTION OF GASES CONSISTING MAINLY FROM HYDROGEN AND CARBON OXIDES WITH A LOW METHIC CONTENT

ES438979A1
(en)

1977-05-16

Hydrodesulphurization catalyst and method of manufacture and use thereof

GB1370841A
(en)

1974-10-16

Production of catalyst for homopolymerization or copolymerization of ethylene

BE824383A
(en)

1975-07-15

MIXTURES CONTAINING POLYIMIDES, CONVERTIBLE INTO FOAMS

ES325035A1
(en)

1967-01-01

Procedure for the manufacture of vinyl acetate. (Machine-translation by Google Translate, not legally binding)

Legal Events

Date
Code
Title
Description

1974-08-14
PS
Patent sealed [section 19, patents act 1949]

1979-05-23
PCNP
Patent ceased through non-payment of renewal fee

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