Patent US2512601A successfully refreshed from Google Patents.
US2512601A
Expired / Lapsed
US
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Production of linear nitrogen-containing polymeric materials
Assignee: Celanese Corp
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Filing: 1949-12-13
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Granted: 1950-06-27
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Expires: 1969-12-13
Abstract
No abstract record available.
Inventors
- 👤 Bates Harold
- 👤 Fisher James Wotherspoon
- 👤 Wheatley Edward William
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:34
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
81 words
PROCESS FOR THE PRODUCTION OF A NITROGENCONTAINING POLYMER, WHICH COMPRISES HEATING A REACTION MIXTURE CONTAINING A DICARBOXYLIC REAGENT SELECTED FROM THE GROUP CONSISTING OF DICARBOXYLIC ACIDS, FREE FROM REACTIVE GROUPS OTHER THAN THE CARBOXY GROUPS, AND THERE ANHYDRIDES, AND CONTAINING HYDRAZINE THE TOTAL AMOUNT OF HYDRAZINE IN THE REACTION MIXTURE BEING MORE THAN TWO MOLES FOR EACH MOLE OF DICARBOXYLIC ACID AND BEING SUFFICIENT TO PRODUCE A POLYMER RESISTANT TO HYDROCHLORIC ACID, AND CONTINUING THE HEATING UNITL THE POLYMER IS PRODUCED.
Claim 2
Dependent Claim
81 words
PROCESS FOR THE PRODUCTION OF A NITROGENCONTAINING POLYMER, WHICH COMPRISES HEATING A REACTION MIXTURE CONTAINING A DICARBOXYLIC REAGENT SELECTED FROM THE GROUP CONSISTING OF DICARBOXYLIC ACIDS, FREE FROM REACTIVE GROUPS OTHER THAN THE CARBOXY GROUPS, AND THERE ANHYDRIDES, AND CONTAINING HYDRAZINE THE TOTAL AMOUNT OF HYDRAZINE IN THE REACTION MIXTURE BEING MORE THAN TWO MOLES FOR EACH MOLE OF DICARBOXYLIC ACID AND BEING SUFFICIENT TO PRODUCE A POLYMER RESISTANT TO HYDROCHLORIC ACID, AND CONTINUING THE HEATING UNITL THE POLYMER IS PRODUCED.
References Cited (Backward Citations)
No citation records indexed.
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 |