US2512667A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Linear nitrogen-containing polymers
Assignee: Celanese Corp
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Filing: 1945-08-04
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Granted: 1950-06-27
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Expires: 1965-08-04
Abstract
No abstract record available.
Inventors
- 👤 Moncrieff Robert Wighton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 14:57
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
47 words
PROCESS FOR THE PRODUCTION OF NITROGEN-CONTAINING POLYMERS, WHICH COMPRISES HEATING A DIHYDRAZIDE OF A DICARBOZYLIC ACID FREE FROM REACTIVE GROUPS OTHER THAN THE CARBOXY GROUPS WITH SUFFICIENT HYDRAZINE TO PRODUCE A PLYMER RESISTANT TO HYDROLYSIS BY HYROCHLORIC ACID, AND CONTINUING THE HEATING UNTIL THE POLYMER IS PRODUCED.
Claim 2
Dependent Claim
47 words
PROCESS FOR THE PRODUCTION OF NITROGEN-CONTAINING POLYMERS, WHICH COMPRISES HEATING A DIHYDRAZIDE OF A DICARBOZYLIC ACID FREE FROM REACTIVE GROUPS OTHER THAN THE CARBOXY GROUPS WITH SUFFICIENT HYDRAZINE TO PRODUCE A PLYMER RESISTANT TO HYDROLYSIS BY HYROCHLORIC ACID, AND CONTINUING THE HEATING UNTIL THE POLYMER IS PRODUCED.
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) | 1953-06-26 | 1953-12-26 | 1954-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-06-26 | 1957-12-26 | 1958-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-06-26 | 1961-12-26 | 1962-06-27 | $7700.00 | Window Closed / Lapsed |