US3259606A
Expired / Lapsed
US
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Novel copolyamides from caprolactam, piperazine and a dicarboxylic acid
Assignee: National Institute of Advanced Industrial Science and Technology
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Filing: 1962-11-19
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Granted: 1966-07-05
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Expires: 1982-11-19
Abstract
No abstract record available.
Inventors
- 👤 Okada Akira
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:12
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/02; C08G69/36; D; D01; D01F; D01F6/00; D01F6/78; D01F6/80
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
83 words
A POLYCARBONAMIDE CONSISTING ESSENTIALLY OF (1) EPSILON-CAPROLACTAM, (2) AT LEAST ONE DIAMINE SELECTED FROM THE GROUP CONSISTING OF PIPERAZINE, 2,5-DIMETHYLPIPERAZINE, AND 2-METHYLPIPERAZINE, AND (3) AT LEAST ONE DICARBOXYLIC ACID SELECTED FROM THE GROUP CONSISTING OF ADIPIC ACID, TEREPHTHALIC ACID, AND ISOPHTHALIC ACID, THE MOLE RATIO OF DIAMINE TO DICARBOXYLIC ACID BEING 1:1, AND THE WEIGHT RATIO OF CAPROLACTAM TO DIAMINE-DICARBOXYLIC ACID BEIN BETWEEN 95:5 AND 80:20, SAID POLYCARBONAMIDE BEING SUITABLE FOR THE MANUFACTURE OF FIBERS HAVING SUPERIOR DYEING AFFINITY AND WATER ABSORPTION PROPERTIES.
Claim 2
Dependent Claim
83 words
A POLYCARBONAMIDE CONSISTING ESSENTIALLY OF (1) EPSILON-CAPROLACTAM, (2) AT LEAST ONE DIAMINE SELECTED FROM THE GROUP CONSISTING OF PIPERAZINE, 2,5-DIMETHYLPIPERAZINE, AND 2-METHYLPIPERAZINE, AND (3) AT LEAST ONE DICARBOXYLIC ACID SELECTED FROM THE GROUP CONSISTING OF ADIPIC ACID, TEREPHTHALIC ACID, AND ISOPHTHALIC ACID, THE MOLE RATIO OF DIAMINE TO DICARBOXYLIC ACID BEING 1:1, AND THE WEIGHT RATIO OF CAPROLACTAM TO DIAMINE-DICARBOXYLIC ACID BEIN BETWEEN 95:5 AND 80:20, SAID POLYCARBONAMIDE BEING SUITABLE FOR THE MANUFACTURE OF FIBERS HAVING SUPERIOR DYEING AFFINITY AND WATER ABSORPTION PROPERTIES.
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) | 1969-07-04 | 1970-01-03 | 1970-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-07-04 | 1974-01-03 | 1974-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-07-04 | 1978-01-03 | 1978-07-05 | $7700.00 | Window Closed / Lapsed |