GB1588663A - Method of the electrical properties of polymeric insulations containing polar additives and the polymeric insulation product thereof - Google Patents
Method of the electrical properties of polymeric insulations containing polar additives and the polymeric insulation product thereof Download PDFInfo
- Publication number
- GB1588663A GB1588663A GB20807/78A GB2080778A GB1588663A GB 1588663 A GB1588663 A GB 1588663A GB 20807/78 A GB20807/78 A GB 20807/78A GB 2080778 A GB2080778 A GB 2080778A GB 1588663 A GB1588663 A GB 1588663A
- Authority
- GB
- United Kingdom
- Prior art keywords
- insulation
- mil
- polymeric
- organic material
- polar organic
- 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
Links
- 238000009413 insulation Methods 0.000 title claims description 22
- 238000000034 method Methods 0.000 title claims description 19
- 239000000654 additive Substances 0.000 title description 5
- 229920001296 polysiloxane Polymers 0.000 claims description 38
- 239000007788 liquid Substances 0.000 claims description 27
- 239000011368 organic material Substances 0.000 claims description 19
- 150000001875 compounds Chemical class 0.000 claims description 17
- 239000003063 flame retardant Substances 0.000 claims description 14
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 13
- 229910052736 halogen Inorganic materials 0.000 claims description 12
- 150000002367 halogens Chemical class 0.000 claims description 12
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 claims description 11
- 238000010292 electrical insulation Methods 0.000 claims description 11
- 229920000098 polyolefin Polymers 0.000 claims description 11
- 239000004020 conductor Substances 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 9
- 229920000642 polymer Polymers 0.000 claims description 8
- 229910000410 antimony oxide Inorganic materials 0.000 claims description 6
- VTRUBDSFZJNXHI-UHFFFAOYSA-N oxoantimony Chemical compound [Sb]=O VTRUBDSFZJNXHI-UHFFFAOYSA-N 0.000 claims description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 5
- 229910052760 oxygen Inorganic materials 0.000 claims description 5
- 239000001301 oxygen Substances 0.000 claims description 5
- 239000011248 coating agent Substances 0.000 claims description 4
- 238000000576 coating method Methods 0.000 claims description 4
- 230000000694 effects Effects 0.000 claims description 4
- LWIGVRDDANOFTD-UHFFFAOYSA-N hydroxy(dimethyl)silane Chemical compound C[SiH](C)O LWIGVRDDANOFTD-UHFFFAOYSA-N 0.000 claims description 4
- AIPVRBGBHQDAPX-UHFFFAOYSA-N hydroxy(methyl)silane Chemical compound C[SiH2]O AIPVRBGBHQDAPX-UHFFFAOYSA-N 0.000 claims description 4
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 claims description 4
- 238000006243 chemical reaction Methods 0.000 claims description 3
- XCLIHDJZGPCUBT-UHFFFAOYSA-N dimethylsilanediol Chemical compound C[Si](C)(O)O XCLIHDJZGPCUBT-UHFFFAOYSA-N 0.000 claims description 3
- 230000002708 enhancing effect Effects 0.000 claims description 3
- ZJBHFQKJEBGFNL-UHFFFAOYSA-N methylsilanetriol Chemical compound C[Si](O)(O)O ZJBHFQKJEBGFNL-UHFFFAOYSA-N 0.000 claims description 3
- 239000000377 silicon dioxide Substances 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 230000015572 biosynthetic process Effects 0.000 claims description 2
- 238000010276 construction Methods 0.000 claims description 2
- 238000007706 flame test Methods 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 230000000717 retained effect Effects 0.000 claims description 2
- 239000003517 fume Substances 0.000 claims 1
- 239000000203 mixture Substances 0.000 description 27
- 239000004615 ingredient Substances 0.000 description 13
- -1 polyethylene Polymers 0.000 description 8
- 239000003795 chemical substances by application Substances 0.000 description 6
- 238000002485 combustion reaction Methods 0.000 description 5
- 229910021485 fumed silica Inorganic materials 0.000 description 5
- 229920000573 polyethylene Polymers 0.000 description 5
- 239000004698 Polyethylene Substances 0.000 description 4
- 229920001577 copolymer Polymers 0.000 description 4
- WHHGLZMJPXIBIX-UHFFFAOYSA-N decabromodiphenyl ether Chemical compound BrC1=C(Br)C(Br)=C(Br)C(Br)=C1OC1=C(Br)C(Br)=C(Br)C(Br)=C1Br WHHGLZMJPXIBIX-UHFFFAOYSA-N 0.000 description 4
- 239000011810 insulating material Substances 0.000 description 4
- 230000000979 retarding effect Effects 0.000 description 4
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 3
- 239000005977 Ethylene Substances 0.000 description 3
- 238000009472 formulation Methods 0.000 description 3
- 150000008282 halocarbons Chemical class 0.000 description 3
- 150000002978 peroxides Chemical class 0.000 description 3
- 239000003340 retarding agent Substances 0.000 description 3
- 229920002379 silicone rubber Polymers 0.000 description 3
- 238000010998 test method Methods 0.000 description 3
- ZNRLMGFXSPUZNR-UHFFFAOYSA-N 2,2,4-trimethyl-1h-quinoline Chemical compound C1=CC=C2C(C)=CC(C)(C)NC2=C1 ZNRLMGFXSPUZNR-UHFFFAOYSA-N 0.000 description 2
- PFANXOISJYKQRP-UHFFFAOYSA-N 2-tert-butyl-4-[1-(5-tert-butyl-4-hydroxy-2-methylphenyl)butyl]-5-methylphenol Chemical compound C=1C(C(C)(C)C)=C(O)C=C(C)C=1C(CCC)C1=CC(C(C)(C)C)=C(O)C=C1C PFANXOISJYKQRP-UHFFFAOYSA-N 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 239000004793 Polystyrene Substances 0.000 description 2
- 230000001627 detrimental effect Effects 0.000 description 2
- 229920001971 elastomer Polymers 0.000 description 2
- CKAPSXZOOQJIBF-UHFFFAOYSA-N hexachlorobenzene Chemical class ClC1=C(Cl)C(Cl)=C(Cl)C(Cl)=C1Cl CKAPSXZOOQJIBF-UHFFFAOYSA-N 0.000 description 2
- 229920006158 high molecular weight polymer Polymers 0.000 description 2
- 150000002469 indenes Chemical class 0.000 description 2
- 229920002223 polystyrene Polymers 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- AQPHBYQUCKHJLT-UHFFFAOYSA-N 1,2,3,4,5-pentabromo-6-(2,3,4,5,6-pentabromophenyl)benzene Chemical group BrC1=C(Br)C(Br)=C(Br)C(Br)=C1C1=C(Br)C(Br)=C(Br)C(Br)=C1Br AQPHBYQUCKHJLT-UHFFFAOYSA-N 0.000 description 1
- DJHWAIPYZDRNMH-UHFFFAOYSA-N 1,2,3,4,5-pentabromo-6-(2-bromophenyl)benzene Chemical group BrC1=CC=CC=C1C1=C(Br)C(Br)=C(Br)C(Br)=C1Br DJHWAIPYZDRNMH-UHFFFAOYSA-N 0.000 description 1
- BJELTSYBAHKXRW-UHFFFAOYSA-N 2,4,6-triallyloxy-1,3,5-triazine Chemical compound C=CCOC1=NC(OCC=C)=NC(OCC=C)=N1 BJELTSYBAHKXRW-UHFFFAOYSA-N 0.000 description 1
- ZSLBIIRFJDSBLX-UHFFFAOYSA-N 2,4-bis(tert-butylperoxy)-2,5-dimethylhexane Chemical compound CC(C)(C)OOC(C(C)C)CC(C)(C)OOC(C)(C)C ZSLBIIRFJDSBLX-UHFFFAOYSA-N 0.000 description 1
- QLZJUIZVJLSNDD-UHFFFAOYSA-N 2-(2-methylidenebutanoyloxy)ethyl 2-methylidenebutanoate Chemical compound CCC(=C)C(=O)OCCOC(=O)C(=C)CC QLZJUIZVJLSNDD-UHFFFAOYSA-N 0.000 description 1
- XMNIXWIUMCBBBL-UHFFFAOYSA-N 2-(2-phenylpropan-2-ylperoxy)propan-2-ylbenzene Chemical compound C=1C=CC=CC=1C(C)(C)OOC(C)(C)C1=CC=CC=C1 XMNIXWIUMCBBBL-UHFFFAOYSA-N 0.000 description 1
- HXIQYSLFEXIOAV-UHFFFAOYSA-N 2-tert-butyl-4-(5-tert-butyl-4-hydroxy-2-methylphenyl)sulfanyl-5-methylphenol Chemical compound CC1=CC(O)=C(C(C)(C)C)C=C1SC1=CC(C(C)(C)C)=C(O)C=C1C HXIQYSLFEXIOAV-UHFFFAOYSA-N 0.000 description 1
- QKUNKVYPGIOQNP-UHFFFAOYSA-N 4,8,11,14,17,21-hexachlorotetracosane Chemical compound CCCC(Cl)CCCC(Cl)CCC(Cl)CCC(Cl)CCC(Cl)CCCC(Cl)CCC QKUNKVYPGIOQNP-UHFFFAOYSA-N 0.000 description 1
- 239000004801 Chlorinated PVC Substances 0.000 description 1
- 239000006057 Non-nutritive feed additive Substances 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- 229920002367 Polyisobutene Polymers 0.000 description 1
- 229920001328 Polyvinylidene chloride Polymers 0.000 description 1
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical class CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 description 1
- QQONPFPTGQHPMA-UHFFFAOYSA-N Propene Chemical class CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229920000457 chlorinated polyvinyl chloride Polymers 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 238000010835 comparative analysis Methods 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 239000003431 cross linking reagent Substances 0.000 description 1
- UGQQAJOWXNCOPY-UHFFFAOYSA-N dechlorane plus Chemical compound C12CCC3C(C4(Cl)Cl)(Cl)C(Cl)=C(Cl)C4(Cl)C3CCC2C2(Cl)C(Cl)=C(Cl)C1(Cl)C2(Cl)Cl UGQQAJOWXNCOPY-UHFFFAOYSA-N 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 235000013870 dimethyl polysiloxane Nutrition 0.000 description 1
- 239000000806 elastomer Substances 0.000 description 1
- 239000005042 ethylene-ethyl acrylate Substances 0.000 description 1
- 229920006244 ethylene-ethyl acrylate Polymers 0.000 description 1
- 229920006225 ethylene-methyl acrylate Polymers 0.000 description 1
- 239000005043 ethylene-methyl acrylate Substances 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- VHHHONWQHHHLTI-UHFFFAOYSA-N hexachloroethane Chemical compound ClC(Cl)(Cl)C(Cl)(Cl)Cl VHHHONWQHHHLTI-UHFFFAOYSA-N 0.000 description 1
- 150000002611 lead compounds Chemical class 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- GVYLCNUFSHDAAW-UHFFFAOYSA-N mirex Chemical compound ClC12C(Cl)(Cl)C3(Cl)C4(Cl)C1(Cl)C1(Cl)C2(Cl)C3(Cl)C4(Cl)C1(Cl)Cl GVYLCNUFSHDAAW-UHFFFAOYSA-N 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 150000002790 naphthalenes Chemical class 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- HMMGMWAXVFQUOA-UHFFFAOYSA-N octamethylcyclotetrasiloxane Chemical compound C[Si]1(C)O[Si](C)(C)O[Si](C)(C)O[Si](C)(C)O1 HMMGMWAXVFQUOA-UHFFFAOYSA-N 0.000 description 1
- 150000001451 organic peroxides Chemical class 0.000 description 1
- 239000012188 paraffin wax Substances 0.000 description 1
- 235000021317 phosphate Nutrition 0.000 description 1
- 150000003013 phosphoric acid derivatives Chemical class 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 239000004014 plasticizer Substances 0.000 description 1
- 229920000435 poly(dimethylsiloxane) Polymers 0.000 description 1
- 229920005862 polyol Polymers 0.000 description 1
- 150000003077 polyols Chemical class 0.000 description 1
- 229920006389 polyphenyl polymer Polymers 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
- 239000005033 polyvinylidene chloride Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000003755 preservative agent Substances 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000005060 rubber Substances 0.000 description 1
- SCPYDCQAZCOKTP-UHFFFAOYSA-N silanol Chemical compound [SiH3]O SCPYDCQAZCOKTP-UHFFFAOYSA-N 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
- 125000003944 tolyl group Chemical group 0.000 description 1
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
- H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
- H01B3/30—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes
- H01B3/44—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes vinyl resins; acrylic resins
- H01B3/441—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes vinyl resins; acrylic resins from alkenes
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
- H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
- H01B3/30—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes
- H01B3/46—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes silicones
Landscapes
- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Organic Insulating Materials (AREA)
- Insulated Conductors (AREA)
- Fireproofing Substances (AREA)
- Processes Of Treating Macromolecular Substances (AREA)
- Inorganic Insulating Materials (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US81685577A | 1977-07-18 | 1977-07-18 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1588663A true GB1588663A (en) | 1981-04-29 |
Family
ID=25221785
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB20807/78A Expired GB1588663A (en) | 1977-07-18 | 1978-05-19 | Method of the electrical properties of polymeric insulations containing polar additives and the polymeric insulation product thereof |
Country Status (9)
Country | Link |
---|---|
JP (2) | JPS587204B2 (enrdf_load_stackoverflow) |
DE (2) | DE2821651C2 (enrdf_load_stackoverflow) |
DK (1) | DK321678A (enrdf_load_stackoverflow) |
ES (2) | ES471842A1 (enrdf_load_stackoverflow) |
FR (1) | FR2398373A1 (enrdf_load_stackoverflow) |
GB (1) | GB1588663A (enrdf_load_stackoverflow) |
HU (1) | HU179475B (enrdf_load_stackoverflow) |
SE (2) | SE436080B (enrdf_load_stackoverflow) |
YU (2) | YU170978A (enrdf_load_stackoverflow) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN115104160A (zh) * | 2020-02-21 | 2022-09-23 | 大金美国股份有限公司 | 汽车通信线缆 |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3581661D1 (de) * | 1984-03-19 | 1991-03-14 | Vulkor Inc | Polyolefinzusammensetzungen mit thermischer stabilitaet und damit ueberzogene leiter. |
DE102004012059A1 (de) * | 2004-03-11 | 2005-10-06 | Siemens Ag | Verfahren zum Herstellen eines Körpers |
JP5737323B2 (ja) | 2013-05-01 | 2015-06-17 | 住友電気工業株式会社 | 電気絶縁ケーブル |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1307208A (fr) * | 1960-12-01 | 1962-10-19 | Thomson Houston Comp Francaise | Compositions vulcanisables à base de polyéthylène à chaînes croisées et leurs applications à l'isolement des conducteurs électriques |
US3553348A (en) * | 1966-11-02 | 1971-01-05 | Gen Electric | Polymeric blends for insulation composition |
US3742084A (en) * | 1971-03-04 | 1973-06-26 | Minnesota Mining & Mfg | Corona-resistant electrically insulating organic polymeric compositions |
US3900681A (en) * | 1973-08-22 | 1975-08-19 | Gen Electric | Insulated electrical conductor |
JPS5441720B2 (enrdf_load_stackoverflow) * | 1974-04-10 | 1979-12-10 |
-
1978
- 1978-05-18 DE DE2821651A patent/DE2821651C2/de not_active Expired
- 1978-05-18 DE DE2857542A patent/DE2857542C2/de not_active Expired
- 1978-05-19 GB GB20807/78A patent/GB1588663A/en not_active Expired
- 1978-07-13 HU HU78GE1038A patent/HU179475B/hu unknown
- 1978-07-13 FR FR7820951A patent/FR2398373A1/fr active Granted
- 1978-07-17 SE SE7807905A patent/SE436080B/sv not_active IP Right Cessation
- 1978-07-17 JP JP53086207A patent/JPS587204B2/ja not_active Expired
- 1978-07-17 YU YU01709/78A patent/YU170978A/xx unknown
- 1978-07-18 ES ES471842A patent/ES471842A1/es not_active Expired
- 1978-07-18 DK DK321678A patent/DK321678A/da not_active Application Discontinuation
-
1979
- 1979-04-03 ES ES479260A patent/ES479260A1/es not_active Expired
-
1981
- 1981-08-21 JP JP56130364A patent/JPS57151672A/ja active Granted
-
1982
- 1982-07-07 SE SE8204208A patent/SE456378B/sv not_active IP Right Cessation
- 1982-08-17 YU YU01784/82A patent/YU178482A/xx unknown
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN115104160A (zh) * | 2020-02-21 | 2022-09-23 | 大金美国股份有限公司 | 汽车通信线缆 |
Also Published As
Publication number | Publication date |
---|---|
HU179475B (en) | 1982-10-28 |
DE2821651C2 (de) | 1983-02-24 |
YU170978A (en) | 1982-10-31 |
DE2821651A1 (de) | 1979-02-08 |
SE456378B (sv) | 1988-09-26 |
JPS6335680B2 (enrdf_load_stackoverflow) | 1988-07-15 |
SE7807905L (sv) | 1979-01-19 |
ES471842A1 (es) | 1980-03-01 |
SE8204208L (sv) | 1982-07-07 |
DK321678A (da) | 1979-01-19 |
FR2398373A1 (fr) | 1979-02-16 |
DE2857542C2 (de) | 1983-02-03 |
ES479260A1 (es) | 1979-08-01 |
JPS5442700A (en) | 1979-04-04 |
YU178482A (en) | 1984-12-31 |
JPS57151672A (en) | 1982-09-18 |
JPS587204B2 (ja) | 1983-02-08 |
SE436080B (sv) | 1984-11-05 |
FR2398373B1 (enrdf_load_stackoverflow) | 1983-09-09 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed [section 19, patents act 1949] | ||
732 | Registration of transactions, instruments or events in the register (sect. 32/1977) | ||
PE20 | Patent expired after termination of 20 years |
Effective date: 19980518 |