Patent US2880197A successfully refreshed from Google Patents.
US2880197A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyoxamides
Assignee: Imperial Chemical Industries Ltd
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Filing: 1956-02-03
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Granted: 1959-03-31
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Expires: 1976-02-03
Abstract
No abstract record available.
Inventors
- 👤 Coleman Denis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:28
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/02; C08G69/26; C08G69/40
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
121 words
THE PROCESS FOR PREPARING A HIGH MOLECULAR WEIGHT, FIBER-FORMING COPOLYMER WHICH COMPRISES COPOLYMERIZING A DICARBOXYLIC COMPONENT SELECTED FROM THE GROUP CONSISITNG OF OXALIC ACID AND AMIDE FORMING DERIVATIVES THEREOF; AN AMINE COMPONENT SELECTED FROM THE GROUP CONSISTING OF MONO- AND DI-METHYL SUBSTITUTED HEXAMETHYLENE DIAMINES WHERIN THE METHYL GROUPS ARE IN THE 2-5 POSITIONS AND FROM 5% TO 35%, BASED ON THE TOTAL WEIGHT OF COPOLYMER, OF A HIGH MOLECULAR WEIGHT POLYETHYLENE OXIDE HAVING AT LEAST TWENTY -(OCH2CH2)- GROUPS AND END GROUPS SELECTED FROM THE CLASS CONSISTING OF CARBOXY GROUPS AND -NH2 GROUPS SAID COPOLYMERIZATION BEING CARRIED OUT BY HEATING SAID COMPONENTS TOGETHER IN THE ABSENCE OF OXYGEN AND WITH THE REMOVAL OF WATER UNTIL SAID MOLECULAR WEIGHT, FIBER-FORMING POLYMER IS OBTAINED.
Claim 2
Dependent Claim
121 words
THE PROCESS FOR PREPARING A HIGH MOLECULAR WEIGHT, FIBER-FORMING COPOLYMER WHICH COMPRISES COPOLYMERIZING A DICARBOXYLIC COMPONENT SELECTED FROM THE GROUP CONSISITNG OF OXALIC ACID AND AMIDE FORMING DERIVATIVES THEREOF; AN AMINE COMPONENT SELECTED FROM THE GROUP CONSISTING OF MONO- AND DI-METHYL SUBSTITUTED HEXAMETHYLENE DIAMINES WHERIN THE METHYL GROUPS ARE IN THE 2-5 POSITIONS AND FROM 5% TO 35%, BASED ON THE TOTAL WEIGHT OF COPOLYMER, OF A HIGH MOLECULAR WEIGHT POLYETHYLENE OXIDE HAVING AT LEAST TWENTY -(OCH2CH2)- GROUPS AND END GROUPS SELECTED FROM THE CLASS CONSISTING OF CARBOXY GROUPS AND -NH2 GROUPS SAID COPOLYMERIZATION BEING CARRIED OUT BY HEATING SAID COMPONENTS TOGETHER IN THE ABSENCE OF OXYGEN AND WITH THE REMOVAL OF WATER UNTIL SAID MOLECULAR WEIGHT, FIBER-FORMING POLYMER IS OBTAINED.
References Cited (Backward Citations)
US2190770A
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US2299839A
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US2360673A
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US2558031A
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US2692873A
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US2659754A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-03-30 | 1962-09-29 | 1963-03-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-03-30 | 1966-09-29 | 1967-03-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-03-30 | 1970-09-29 | 1971-03-31 | $7700.00 | Window Closed / Lapsed |