Patent US3294758A successfully refreshed from Google Patents.
US3294758A
Expired / Lapsed
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Amorphous polyamides from a mixture of an alkyl substituted aliphatic diamine and unsubstituted aliphatic diamine
Assignee: WR Grace and Co
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Filing: 1963-08-08
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Granted: 1966-12-27
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Expires: 1983-08-08
Abstract
No abstract record available.
Inventors
- 👤 Gabler Rudolf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:56
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/02; C08G69/26; C08G69/265
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
107 words
A LINEAR COPOLYAMIDE OF AN AROMATIC DICARBOXYLIC ACID SELECTED FROM THE GROUP CONSISTING OF TEREPHTHALIC ACID, ISOPHTHALIC ACID AND MIXTURE THEREOF AND A SUBSTANTIALLY EQUIMOLAR AMOUNT OF A DIAMINE MIXTURE CONSISTING OF ABOUT 95 TO 70 PERCENT BY WEIGHT OF A SUBSTITUTED POLYMETHYLENE DIAMINE HAVING A STRAIGHT HYDROCARBON CHAIN OF AT LEAST 6 CARBON ATOMS , SAID STRAIGHT CHAIN BEING SUBSTITUTED BY AT LEAST ONE ALKYL GROUP, THE TOTAL NUMBER OF SIDE CHAIN CARBON ATOMS INTRODUCED BU ALKYL SUBSTITUTION BEING AT LEAST 2, AND ABPUT PERCENT BY WEIGHT OF AN UNSUBSTITUTED POLYMETHYLENE DIAMINE OF THE SAME CHAIN LENGTH SAID COPOLYAMIDE BEING AMORPHOUS AND RESISTANT TO BOILING WATER.
Claim 2
Dependent Claim
107 words
A LINEAR COPOLYAMIDE OF AN AROMATIC DICARBOXYLIC ACID SELECTED FROM THE GROUP CONSISTING OF TEREPHTHALIC ACID, ISOPHTHALIC ACID AND MIXTURE THEREOF AND A SUBSTANTIALLY EQUIMOLAR AMOUNT OF A DIAMINE MIXTURE CONSISTING OF ABOUT 95 TO 70 PERCENT BY WEIGHT OF A SUBSTITUTED POLYMETHYLENE DIAMINE HAVING A STRAIGHT HYDROCARBON CHAIN OF AT LEAST 6 CARBON ATOMS , SAID STRAIGHT CHAIN BEING SUBSTITUTED BY AT LEAST ONE ALKYL GROUP, THE TOTAL NUMBER OF SIDE CHAIN CARBON ATOMS INTRODUCED BU ALKYL SUBSTITUTION BEING AT LEAST 2, AND ABPUT PERCENT BY WEIGHT OF AN UNSUBSTITUTED POLYMETHYLENE DIAMINE OF THE SAME CHAIN LENGTH SAID COPOLYAMIDE BEING AMORPHOUS AND RESISTANT TO BOILING WATER.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-12-26 | 1970-06-27 | 1970-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-12-26 | 1974-06-27 | 1974-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-12-26 | 1978-06-27 | 1978-12-27 | $7700.00 | Window Closed / Lapsed |