GB1534258A - Process for the production of elastomeric polyurethane-polyurea moulded products having a compact surface skin - Google Patents

Process for the production of elastomeric polyurethane-polyurea moulded products having a compact surface skin

Info

Publication number
GB1534258A
GB1534258A GB2066377A GB2066377A GB1534258A GB 1534258 A GB1534258 A GB 1534258A GB 2066377 A GB2066377 A GB 2066377A GB 2066377 A GB2066377 A GB 2066377A GB 1534258 A GB1534258 A GB 1534258A
Authority
GB
United Kingdom
Prior art keywords
groups
elastomeric polyurethane
polyurea
component
production
Prior art date
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
GB2066377A
Other languages
English (en)
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.)
Bayer AG
Original Assignee
Bayer 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.)
Filing date
Publication date
Application filed by Bayer AG filed Critical Bayer AG
Publication of GB1534258A publication Critical patent/GB1534258A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
    • C08G18/30—Low-molecular-weight compounds
    • C08G18/32—Polyhydroxy compounds; Polyamines; Hydroxyamines
    • C08G18/3225—Polyamines
    • C08G18/3237—Polyamines aromatic
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
    • C08G18/65—Low-molecular-weight compounds having active hydrogen with high-molecular-weight compounds having active hydrogen
    • C08G18/6505—Low-molecular-weight compounds having active hydrogen with high-molecular-weight compounds having active hydrogen the low-molecular compounds being compounds of group C08G18/32 or polyamines of C08G18/38
    • C08G18/6523—Compounds of group C08G18/3225 or C08G18/3271 or polyamines of C08G18/38
    • C08G18/6529—Compounds of group C08G18/3225 or polyamines of C08G18/38
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G2120/00—Compositions for reaction injection moulding processes

Landscapes

  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Polyurethanes Or Polyureas (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
GB2066377A 1976-05-21 1977-05-17 Process for the production of elastomeric polyurethane-polyurea moulded products having a compact surface skin Expired GB1534258A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19762622951 DE2622951B2 (de) 1976-05-21 1976-05-21 Verfahren zur Herstellung von elastischen Fonnkörpern

Publications (1)

Publication Number Publication Date
GB1534258A true GB1534258A (en) 1978-11-29

Family

ID=5978732

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2066377A Expired GB1534258A (en) 1976-05-21 1977-05-17 Process for the production of elastomeric polyurethane-polyurea moulded products having a compact surface skin

Country Status (9)

Country Link
JP (1) JPS52142797A (enExample)
BE (1) BE854855A (enExample)
BR (1) BR7703229A (enExample)
DE (1) DE2622951B2 (enExample)
ES (1) ES458968A1 (enExample)
FR (1) FR2352010A1 (enExample)
GB (1) GB1534258A (enExample)
IT (1) IT1078147B (enExample)
SE (1) SE437377B (enExample)

Cited By (29)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4269945A (en) 1980-01-24 1981-05-26 The Dow Chemical Company Reaction injection molded polyurethanes employing aliphatic amine chain extenders
US4296212A (en) 1980-08-27 1981-10-20 The Upjohn Company Elastomeric polyurethane-polyurea polymer prepared from an organic polyisocyanate a polyol and an aromatic diamine having at least one of the ortho positions to each amine lower alkyl
US4298701A (en) * 1979-04-24 1981-11-03 Bayer Aktiengesellschaft Process for the production of elastic shaped articles
US4309378A (en) 1979-08-16 1982-01-05 Bayer Aktiengesellschaft Process for the production of pneumatic tires having particularly high dynamic strength
EP0044481A1 (de) * 1980-07-21 1982-01-27 Mobay Chemical Corporation Verfahren zur Herstellung elastischer geformter Gegenstände
US4314962A (en) 1980-12-29 1982-02-09 Ethyl Corporation Phenol extended polyurethanes prepared by RIM process
US4324867A (en) 1980-10-06 1982-04-13 Basf Wyandotte Corporation Process for the preparation of molded polyurethane-polyurea elastomers and molded parts prepared thereby
GB2131737A (en) * 1982-10-21 1984-06-27 Macchi International Spa Shaped bodies and method for their production
US4459399A (en) * 1981-09-18 1984-07-10 Ethyl Corporation Polyurethanes and process therefor
US4469653A (en) * 1981-07-04 1984-09-04 Basf Aktiengesellschaft Process for the preparation of molded parts of polyurethane or polyurethane-polyurea employing monocyclic amidines
US4477644A (en) * 1983-08-08 1984-10-16 The Dow Chemical Company Reaction injection molded polyurethanes employing thiapolycyclic polyahls as chain extenders
US4526905A (en) * 1982-07-06 1985-07-02 Ethyl Corporation Polyurethanes from dialkyl diaminobenzenes and processes therefor
US4530941A (en) * 1983-01-26 1985-07-23 The Dow Chemical Company Reaction injection molded polyurethanes employing high molecular weight polyols
US4576998A (en) * 1984-12-07 1986-03-18 The Dow Chemical Company Vinyl urethane composite polymer containing vinyl terminated urethane oligomers
US4642320A (en) * 1983-11-02 1987-02-10 The Dow Chemical Company Reaction injection molded polyureas employing high molecular weight amine-terminated polyethers
US4667009A (en) * 1985-09-25 1987-05-19 The Dow Chemical Company Polymethylene polyphenylamine modified diamine chain extenders in polyurea elastomers
US4876019A (en) * 1983-02-16 1989-10-24 The Dow Chemical Company Internal mold release compositions
US4929697A (en) * 1987-08-07 1990-05-29 Mobay Corporation Use of ester group containing polyols in a rim process
US4937366A (en) * 1989-02-13 1990-06-26 Mobay Corporation Process and compositions for production of moldings
US4963640A (en) * 1989-02-13 1990-10-16 Mobay Corporation Process and compositions for production of moldings
US5003027A (en) * 1987-08-07 1991-03-26 Mobay Corporation Ester group containing polyols in a RIM process
US5008033A (en) * 1983-02-16 1991-04-16 The Dow Chemical Company Internal mold release compositions
US5011647A (en) * 1983-02-16 1991-04-30 The Dow Chemical Company Internal mold release compositions
US6866804B2 (en) * 1997-01-23 2005-03-15 Sunstar Suisse Sa Two-pack urethane foam composition, and two-pack urethane foam composition injecting apparatus and method
EP1717256A1 (en) * 2005-04-28 2006-11-02 Bayer MaterialScience AG Reaction injection moulding process for the production of a polyurethane skin layer
US9353210B2 (en) 2012-09-04 2016-05-31 Covestro Deutschland Ag Silane functional binder with thiourethane structure
US9458282B2 (en) 2009-01-22 2016-10-04 Covestro Deutchland Ag Polyurethane sealing compounds
US10294198B2 (en) 2014-04-11 2019-05-21 Covestro Deutschland Ag Method for producing xylylene diisocyanates in the gaseous phase
US11795266B2 (en) 2019-05-27 2023-10-24 Covestro Intellectual Property Gmbh & Co. Kg Method for preparing a mixed silane-terminated polymer

Families Citing this family (48)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1123167A (en) * 1978-04-11 1982-05-11 Steven M. Conover Process for the production of elastomeric moldings
DE2837501A1 (de) * 1978-08-28 1980-03-20 Basf Ag Transparente, elastische polyurethan-harnstoff-elastomere
JPS5558215A (en) * 1978-10-24 1980-04-30 Asahi Glass Co Ltd Urethane elastomer composition for reaction injection molding
DE2940738A1 (de) * 1979-10-08 1981-04-16 Basf Ag, 6700 Ludwigshafen Verfahren zur herstellung von gegebenenfalls zellhaltigen polyurethan-polyharnstoff-formkoerpern
JPS5767624A (en) * 1980-10-14 1982-04-24 Ihara Chem Ind Co Ltd Preparation of polyurthane elastomer
DE3147736A1 (de) * 1981-12-02 1983-06-09 Bayer Ag, 5090 Leverkusen Verfahren zur herstellung von elastischen formkoerpern
DE3203490A1 (de) * 1982-02-03 1983-08-11 Bayer Ag, 5090 Leverkusen Verfahren zur herstellung von ueberzuegen
DE3242559A1 (de) * 1982-11-18 1984-05-24 Basf Ag, 6700 Ludwigshafen Verfahren zur herstellung von gegebenenfalls zelligen polyurethan-polyharnstoff-formkoerpern
US4442235A (en) * 1983-05-09 1984-04-10 Mobay Chemical Corporation Process and composition for the production of polyurethane elastomer moldings
US4519432A (en) * 1984-02-08 1985-05-28 Lim International S.A. Reinforced polyurethane tires
DE3407931A1 (de) * 1984-03-03 1985-09-05 Bayer Ag, 5090 Leverkusen Verfahren zur herstellung von formkoerpern auf basis von harnstoffgruppen aufweisenden polyurethanen
DE3413938C2 (de) * 1984-04-13 1994-07-07 Basf Ag Verfahren zur Herstellung von Verstärkungsmittel enthaltenden kompakten oder zelligen Polyurethan-, Polyharnstoff- oder Polyurethan-Polyharnstoff-Formkörpern
DE3433979A1 (de) * 1984-09-15 1986-03-27 Bayer Ag, 5090 Leverkusen Verwendung von sterisch gehinderten aromatischen diaminen bei der herstellung von polyurethanschaumstoffen
JPS62101623A (ja) * 1984-10-25 1987-05-12 ザ　ダウ　ケミカル　コンパニ− 高曲げ弾性率エラストマ−の製造方法
DE3636604A1 (de) * 1986-10-28 1988-05-05 Bayer Ag Verfahren zur herstellung von polyurethanformkoerpern
DE3802427A1 (de) * 1987-10-06 1989-08-03 Bayer Ag Verfahren zur herstellung von formkoerpern oder folien
DE3827595A1 (de) * 1988-08-13 1990-02-22 Bayer Ag Verfahren zur herstellung von urethangruppen ausweisenden polyharnstoff-elastomeren
US5538679A (en) * 1988-11-29 1996-07-23 Bayer Aktiengesellschaft Process of making molded products
JPH02296815A (ja) * 1989-05-11 1990-12-07 Sumitomo Bayer Urethane Kk インテグラルスキンポリウレタン成形品の製造
DE4431963A1 (de) 1994-09-08 1996-03-14 Bayer Ag Verfahren zur Herstellung von elastischen Formkörpern
DE4442379A1 (de) 1994-11-29 1996-05-30 Bayer Ag Verfahren zum glykolytischen Abbau von Polyurethankunststoffen
DE10160375B4 (de) * 2001-12-10 2012-12-13 Basf Se Polyurethane und deren Verwendung als Karosserieaußenteile
DE10247789A1 (de) * 2002-10-14 2004-04-22 Bayer Ag Zellige Polyurethanelastomere, Verfahren zu ihrer Herstellung und ihre Verwendung
DE10359075B3 (de) 2003-12-17 2005-06-02 Bayer Materialscience Ag Verfahren zur Herstellung von Polyurethanintegralschaumstoffen
CN101440207B (zh) * 2007-09-19 2012-08-08 住化拜耳氨酯株式会社 表皮整体成形品、表皮整体成形品以及带表皮的层叠体的制造方法
DE102008035947B4 (de) 2008-07-31 2015-03-26 Kraussmaffei Technologies Gmbh Verfahren zur Herstellung eines Produktes aus reaktiven Ausgangsstoffen
DE102008036995A1 (de) 2008-08-07 2010-02-11 Bayer Materialscience Ag Kunststoffformteile aus Polyurethan und deren Verwendung
DE102009005711A1 (de) 2009-01-22 2010-07-29 Bayer Materialscience Ag Polyurethanvergussmassen
DE102010031681A1 (de) 2010-07-20 2012-01-26 Bayer Materialscience Ag Polyurethane mit geringem Volumenschrumpf
DE102010031684A1 (de) 2010-07-20 2012-01-26 Bayer Materialscience Ag Polyurethane mit hoher Lichtbrechung
DE102010031683A1 (de) 2010-07-20 2012-01-26 Bayer Materialscience Ag Polyisocyanatgemische
JP5627333B2 (ja) * 2010-08-12 2014-11-19 住化バイエルウレタン株式会社 インテグラルスキンフォーム用ポリウレタン組成物
JP2014511904A (ja) 2011-03-24 2014-05-19 バイエル・インテレクチュアル・プロパティ・ゲゼルシャフト・ミット・ベシュレンクテル・ハフツング 強化ポリウレタン尿素エラストマーからなる成形部品およびその使用
JP5358635B2 (ja) * 2011-09-06 2013-12-04 株式会社日立製作所 ポリウレタン分解液及びポリウレタン分解液形成方法
WO2013160226A1 (de) 2012-04-23 2013-10-31 Bayer Materialscience Ag Lichtechte polyurethanzusammensetzung
EP2877507A1 (de) 2012-07-27 2015-06-03 Bayer Materialscience AG Klebstoff-formulierungen
CN104583191B (zh) 2012-08-28 2017-07-25 科思创德国股份有限公司 具有环状碳酸酯结构的粘合剂
JP6568087B2 (ja) 2014-01-31 2019-08-28 コベストロ、ドイチュラント、アクチエンゲゼルシャフトＣｏｖｅｓｔｒｏ Ｄｅｕｔｓｃｈｌａｎｄ Ａｇ シラン変性ホルムアミド
WO2016174027A1 (de) 2015-04-28 2016-11-03 Covestro Deutschland Ag Polyurethanummantelungen mit verminderter wasseraufnahme und deren verwendung
EP3501642A1 (de) 2017-12-22 2019-06-26 Covestro Deutschland AG Verfahren zur herstellung gemischter silanterminierter polymere
EP3763792A1 (de) 2019-07-11 2021-01-13 Covestro Deutschland AG Verfahren zur herstellung von isocyanuraten aus uretdionen
US20220251280A1 (en) 2019-07-11 2022-08-11 Covestro Intellectual Property Gmbh & Co. Kg Process of preparing allophanate- and/or thioallophanate group-containing compounds
EP3892659A1 (de) 2020-04-08 2021-10-13 Covestro Deutschland AG Mit aus cashewnuss-schalenöl erhältlichen phenolen blockierte, niedrigviskose isocyanat-prepolymere, verfahren zur deren herstellung und deren verwendung
EP3916032A1 (de) 2020-05-29 2021-12-01 Covestro Deutschland AG Bei niedrigen temperaturen vernetzende uretdiongruppen enthaltende zusammensetzungen
EP4029892A1 (de) 2021-01-13 2022-07-20 Covestro Deutschland AG Uretdiongruppen enthaltende zusammensetzungen
EP4265663A1 (de) 2022-04-21 2023-10-25 Covestro Deutschland AG Polyaspartat-basierte zweikomponenten-beschichtungszusammensetzungen zur herstellung von beschichtungen mit guten selbstheilungseigenschaften bei gleichzeitig geringer klebrigkeit
WO2025108919A1 (en) 2023-11-21 2025-05-30 Covestro Deutschland Ag Blocked isocyanate prepolymer system, method for preparing the same, and application thereof
EP4606829A1 (de) 2024-02-23 2025-08-27 Covestro Deutschland AG Verfahren zur herstellung alkoxysilanfunktioneller polyurethane und polyurethanharnstoffe

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1240654B (de) * 1965-05-14 1967-05-18 Bayer Ag Verfahren zur Herstellung vernetzter Kunststoffe nach dem Isocyanat-Polyadditions-Verfahren
FR92371E (enExample) * 1966-11-23
FR92377E (fr) * 1966-12-26 1968-10-31 Kuhlmann Ets Composition de polyuréthane-polyurée conduisant en un seul stade à un produit cellulaire et à un élastomère compact
US3591532A (en) * 1966-12-27 1971-07-06 Upjohn Co High density cellular polyurethane elastomer
JPS5038680A (enExample) * 1973-08-08 1975-04-10

Cited By (34)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4298701A (en) * 1979-04-24 1981-11-03 Bayer Aktiengesellschaft Process for the production of elastic shaped articles
US4309378A (en) 1979-08-16 1982-01-05 Bayer Aktiengesellschaft Process for the production of pneumatic tires having particularly high dynamic strength
US4269945A (en) 1980-01-24 1981-05-26 The Dow Chemical Company Reaction injection molded polyurethanes employing aliphatic amine chain extenders
EP0044481A1 (de) * 1980-07-21 1982-01-27 Mobay Chemical Corporation Verfahren zur Herstellung elastischer geformter Gegenstände
US4379105A (en) 1980-07-21 1983-04-05 Mobay Chemical Corporation Process for the production of elastic shaped articles
DE3133859A1 (de) * 1980-08-27 1982-04-29 The Upjohn Co., 49001 Kalamazoo, Mich. Elastomere polyurethan-polyharnstoff-polymerisate und daraus hergestellte formlinge
US4296212A (en) 1980-08-27 1981-10-20 The Upjohn Company Elastomeric polyurethane-polyurea polymer prepared from an organic polyisocyanate a polyol and an aromatic diamine having at least one of the ortho positions to each amine lower alkyl
US4324867A (en) 1980-10-06 1982-04-13 Basf Wyandotte Corporation Process for the preparation of molded polyurethane-polyurea elastomers and molded parts prepared thereby
US4314962A (en) 1980-12-29 1982-02-09 Ethyl Corporation Phenol extended polyurethanes prepared by RIM process
US4469653A (en) * 1981-07-04 1984-09-04 Basf Aktiengesellschaft Process for the preparation of molded parts of polyurethane or polyurethane-polyurea employing monocyclic amidines
US4459399A (en) * 1981-09-18 1984-07-10 Ethyl Corporation Polyurethanes and process therefor
US4526905A (en) * 1982-07-06 1985-07-02 Ethyl Corporation Polyurethanes from dialkyl diaminobenzenes and processes therefor
GB2131737A (en) * 1982-10-21 1984-06-27 Macchi International Spa Shaped bodies and method for their production
US4530941A (en) * 1983-01-26 1985-07-23 The Dow Chemical Company Reaction injection molded polyurethanes employing high molecular weight polyols
US5008033A (en) * 1983-02-16 1991-04-16 The Dow Chemical Company Internal mold release compositions
US4876019A (en) * 1983-02-16 1989-10-24 The Dow Chemical Company Internal mold release compositions
US5011647A (en) * 1983-02-16 1991-04-30 The Dow Chemical Company Internal mold release compositions
US4477644A (en) * 1983-08-08 1984-10-16 The Dow Chemical Company Reaction injection molded polyurethanes employing thiapolycyclic polyahls as chain extenders
US4642320A (en) * 1983-11-02 1987-02-10 The Dow Chemical Company Reaction injection molded polyureas employing high molecular weight amine-terminated polyethers
US4576998A (en) * 1984-12-07 1986-03-18 The Dow Chemical Company Vinyl urethane composite polymer containing vinyl terminated urethane oligomers
US4667009A (en) * 1985-09-25 1987-05-19 The Dow Chemical Company Polymethylene polyphenylamine modified diamine chain extenders in polyurea elastomers
EP0219709A3 (en) * 1985-09-25 1988-02-03 The Dow Chemical Company Polymethylene polyphenylamine modified diamine chain extenders and polyurea elastomers therefrom
US5003027A (en) * 1987-08-07 1991-03-26 Mobay Corporation Ester group containing polyols in a RIM process
US4929697A (en) * 1987-08-07 1990-05-29 Mobay Corporation Use of ester group containing polyols in a rim process
US4963640A (en) * 1989-02-13 1990-10-16 Mobay Corporation Process and compositions for production of moldings
US4937366A (en) * 1989-02-13 1990-06-26 Mobay Corporation Process and compositions for production of moldings
US6866804B2 (en) * 1997-01-23 2005-03-15 Sunstar Suisse Sa Two-pack urethane foam composition, and two-pack urethane foam composition injecting apparatus and method
US7459107B2 (en) 1997-01-23 2008-12-02 Sunstar Suisse Sa Two-pack urethane foam composition, and two-pack urethane foam composition injecting apparatus and method
EP1717256A1 (en) * 2005-04-28 2006-11-02 Bayer MaterialScience AG Reaction injection moulding process for the production of a polyurethane skin layer
US7572404B2 (en) 2005-04-28 2009-08-11 Bayer Materialscience Ag Vehicle interior article of skin-integrated laminate, method for manufacturing non-foaming polyurethane resin and method for manufacturing skin-integrated laminate using the same
US9458282B2 (en) 2009-01-22 2016-10-04 Covestro Deutchland Ag Polyurethane sealing compounds
US9353210B2 (en) 2012-09-04 2016-05-31 Covestro Deutschland Ag Silane functional binder with thiourethane structure
US10294198B2 (en) 2014-04-11 2019-05-21 Covestro Deutschland Ag Method for producing xylylene diisocyanates in the gaseous phase
US11795266B2 (en) 2019-05-27 2023-10-24 Covestro Intellectual Property Gmbh & Co. Kg Method for preparing a mixed silane-terminated polymer

Also Published As

Publication number Publication date
DE2622951C3 (enExample) 1989-08-31
IT1078147B (it) 1985-05-08
SE7705810L (sv) 1977-11-22
JPS5417359B2 (enExample) 1979-06-29
DE2622951A1 (de) 1977-11-24
SE437377B (sv) 1985-02-25
JPS52142797A (en) 1977-11-28
FR2352010A1 (fr) 1977-12-16
FR2352010B1 (enExample) 1984-04-13
BE854855A (fr) 1977-11-21
DE2622951B2 (de) 1979-09-06
BR7703229A (pt) 1978-06-06
ES458968A1 (es) 1978-02-16

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Legal Events

Date Code Title Description
PS Patent sealed
429H Application (made) for amendment of specification now open to opposition (sect. 29/1949)
429D Case decided by the comptroller ** specification amended (sect. 29/1949)
SPA Amended specification published
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19960517