US3232909A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solid state polymerization of polyamideforming reactants under autogenous pressure
Assignee: Celanese Corp
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Filing: 1961-12-29
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Granted: 1966-02-01
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Expires: 1981-12-29
Abstract
No abstract record available.
Inventors
- 👤 Allen C Werner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:56
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/02; C08G69/26; C08G69/28; C08G69/30
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
78 words
A PROCESS COMPRISING SUBJECTING A POLYAMIDE PRECURSOR SALT OF A DIAMINE AND A DICARBOXYLIC ACID TO A POLYMERIZATION TEMPERATURE UNDER AUTOGENOUS PRESSURE DEVELOPED BY RETAINING EFFLUENT VAPORS IN A CLOSED REACTION SPACE DURING THE POLYMERIZATION REACTION, WHILE CAUSING MOVEMENT OF THE PARTICLES OF SAID PRECURSOR WITH RESPECT TO ONE ANOTHER, SAID AUTOGENOUSPRESSURE REACHING A MAXIMUM OF AT LEAST 300 P.S.I.G., THE HEAT EXPENDED IN MAINTAINING SAID TEMPERATURE BEING INSUFFICIENT TO COMPLETELY LIQUEFY THE PARTICLES OF THE POLYMERIZING MASS.
Claim 2
Dependent Claim
78 words
A PROCESS COMPRISING SUBJECTING A POLYAMIDE PRECURSOR SALT OF A DIAMINE AND A DICARBOXYLIC ACID TO A POLYMERIZATION TEMPERATURE UNDER AUTOGENOUS PRESSURE DEVELOPED BY RETAINING EFFLUENT VAPORS IN A CLOSED REACTION SPACE DURING THE POLYMERIZATION REACTION, WHILE CAUSING MOVEMENT OF THE PARTICLES OF SAID PRECURSOR WITH RESPECT TO ONE ANOTHER, SAID AUTOGENOUSPRESSURE REACHING A MAXIMUM OF AT LEAST 300 P.S.I.G., THE HEAT EXPENDED IN MAINTAINING SAID TEMPERATURE BEING INSUFFICIENT TO COMPLETELY LIQUEFY THE PARTICLES OF THE POLYMERIZING MASS.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-01-31 | 1969-08-02 | 1970-02-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-01-31 | 1973-08-02 | 1974-02-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-01-31 | 1977-08-02 | 1978-02-01 | $7700.00 | Window Closed / Lapsed |