US2913433A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyamides from hydrocarbon substituted piperazines and carboxyclic dicarboxylic acid
Assignee: EIDP Inc
•
Filing: 1955-12-28
•
Granted: 1959-11-17
•
Expires: 1975-12-28
Abstract
No abstract record available.
Inventors
- 👤 Emerson L Wittbecker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 01:51
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/02; C08G69/26
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
63 words
A FIBER-FORMING SYNTHETIC, LINEAR CONDENSATION POLYMER CAPABLE OF ORIENTATION ALONG THE FIBER AXIS WHEREIN AT LEAST ABOUT 50 MOL PERCENT OF THE UNITS MAKING UP THE POLYMER ARE UNITS OF A POLYCARBONAMIDE OF (A) AT LEAST ONE PIPERAZINE IN WHICH AT LEAST ONE HYDROGEN ON CARBON OF THE PIPERAZINE NUCLEUS IS REPLACED BY A HYDROCARBON RADICAL, THE SAID HYDROCARBON RADICAL CONTAINING UP TO
Claim 2
Dependent Claim
63 words
A FIBER-FORMING SYNTHETIC, LINEAR CONDENSATION POLYMER CAPABLE OF ORIENTATION ALONG THE FIBER AXIS WHEREIN AT LEAST ABOUT 50 MOL PERCENT OF THE UNITS MAKING UP THE POLYMER ARE UNITS OF A POLYCARBONAMIDE OF (A) AT LEAST ONE PIPERAZINE IN WHICH AT LEAST ONE HYDROGEN ON CARBON OF THE PIPERAZINE NUCLEUS IS REPLACED BY A HYDROCARBON RADICAL, THE SAID HYDROCARBON RADICAL CONTAINING UP TO
References Cited (Backward Citations)
US2130948A
Cited
US2252554A
Cited
US2274831A
Cited
US2279752A
Cited
US2400022A
Cited
GB614625A
Cited
US2516289A
Cited
DE831326C
Cited
US2625536A
Cited
US2708617A
Cited
US2831834A
Cited
BE529414A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-11-16 | 1963-05-18 | 1963-11-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-11-16 | 1967-05-18 | 1967-11-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-11-16 | 1971-05-18 | 1971-11-17 | $7700.00 | Window Closed / Lapsed |