US2836579A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polycarbonamide from hexamethylene diamine and 2, 2-bis-(carboxyphenyl) propane
Assignee: EIDP Inc
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Filing: 1953-08-10
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Granted: 1958-05-27
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Expires: 1973-08-10
Abstract
No abstract record available.
Inventors
- 👤 Carl E Schweitzer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:16
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/02; C08G69/26
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
24 words
A TOUGH, AMORPHOUS POLYCARBONAMIDE OF HEXAMETHYLENE DIAMINE WITH A MEMBER OF THE CLASS CONSISTING OF 2,2-BIS-(P-CARBOXYPHENYL)PROPANE AND 2,2-BIS(M-CARBOXYPHENYL)PROPANE, HAVING ALTERNATING UNITS OF THE STRUCTURE
Claim 2
Dependent Claim
24 words
A TOUGH, AMORPHOUS POLYCARBONAMIDE OF HEXAMETHYLENE DIAMINE WITH A MEMBER OF THE CLASS CONSISTING OF 2,2-BIS-(P-CARBOXYPHENYL)PROPANE AND 2,2-BIS(M-CARBOXYPHENYL)PROPANE, HAVING ALTERNATING UNITS OF THE STRUCTURE
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) | 1961-05-26 | 1961-11-25 | 1962-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-05-26 | 1965-11-25 | 1966-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-05-26 | 1969-11-25 | 1970-05-27 | $7700.00 | Window Closed / Lapsed |