US2512631A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydrazine polymers
Assignee: Celanese Corp
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Filing: 1949-03-01
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Granted: 1950-06-27
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Expires: 1969-03-01
Abstract
No abstract record available.
Inventors
- 👤 Fisher James Wotherspoon
- 👤 Wheatley Edward William
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:16
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
95 words
PROCESS FOR IMPROVING THE PROPERTIES OF A PREFORMED LINEAR POLYMER OBTAINED BY HEATING A REACTION MIXTURE, WHICH REACTION MIXTURE ON COMPLETE HYDROLYSIS YIELDS A DICARBOXYLIC ACID FREE FROM REACTIVE GROUPS OTHER THAN THE CARBOXY GROUPS AND FROM 1 TO 2 MOLE OF HYDRAZINE FOR EACH MOLE OF DICARBOXYLIC ACID, WHICH POLYMER SUFFERS A SUBSTANTIALLOSS IN INTRINSIC VISCOSITY ON HYDROLYSIS WITH HYDROCHLORIC ACID, WHICH COMPRISES HEATING THE SAID POLYMER WITH AN INOGANIC BASE SELECTED FROM THE GROUP CONSISTING OF HYDRAZINE AND AMMONIA, AND CONTINUING THE HEATING TO PRODUCE A POLYMER RESISTANT TO HYDROLYSIS BY HYDROCHLORIC ACID.
Claim 2
Dependent Claim
95 words
PROCESS FOR IMPROVING THE PROPERTIES OF A PREFORMED LINEAR POLYMER OBTAINED BY HEATING A REACTION MIXTURE, WHICH REACTION MIXTURE ON COMPLETE HYDROLYSIS YIELDS A DICARBOXYLIC ACID FREE FROM REACTIVE GROUPS OTHER THAN THE CARBOXY GROUPS AND FROM 1 TO 2 MOLE OF HYDRAZINE FOR EACH MOLE OF DICARBOXYLIC ACID, WHICH POLYMER SUFFERS A SUBSTANTIALLOSS IN INTRINSIC VISCOSITY ON HYDROLYSIS WITH HYDROCHLORIC ACID, WHICH COMPRISES HEATING THE SAID POLYMER WITH AN INOGANIC BASE SELECTED FROM THE GROUP CONSISTING OF HYDRAZINE AND AMMONIA, AND CONTINUING THE HEATING TO PRODUCE A POLYMER RESISTANT TO HYDROLYSIS BY HYDROCHLORIC ACID.
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 |