US2987507A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of nylon polymers
Assignee: California Research LLC
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Filing: 1957-11-26
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Granted: 1961-06-06
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Expires: 1977-11-26
Abstract
No abstract record available.
Inventors
- 👤 Irving E Levine
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 09:05
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/02; C08G69/26; C08G69/28; C08G69/30
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
119 words
A PROCESS FOR PRODUCING A SUPERPOLYAMIDE FROM A PRECURSOR DIAMINE-DICARBOXYLIC ACID SALT WHICH COMPRISES SUSPENDING IN A POLYMERIZATION ZONE SAID SALT IN A NONSOLVENT FOR BOTH THE SALT AND SUPERPOLYAMIDE, HEATING THE SUSPENSION TO A TEMPERATURE SUFFICIENTLY HIGH TO LIBERATE WATER BUT BELOW THE MELTING POINT OF THE SALT, CONTINUING SAID HEATING UNTIL ABOUT 50% TO 70% OF THE THEORETICAL AMOUNT OF WATER OF CONDENSATION HAS BEEN EVOLVED, THEREAFTER GRADUALLY RAISING THE TEMPERATURE UP TO A POINT AT LEAST ABOUT 10*C. BELOW THE MELTING POINT OF THE POLYMER TO LIBERATE MORE WATER AND RECOVERING FREE-FLOWING POLYMER, THE BOILING POINT OF THE NON-SOLVENT BEING SUFFICIENTLY HIGH SO THAT SUBSTANTIALLY ALL OF IT IS RETAINED DURING THE COURSE OF THE REACTION.
Claim 2
Dependent Claim
119 words
A PROCESS FOR PRODUCING A SUPERPOLYAMIDE FROM A PRECURSOR DIAMINE-DICARBOXYLIC ACID SALT WHICH COMPRISES SUSPENDING IN A POLYMERIZATION ZONE SAID SALT IN A NONSOLVENT FOR BOTH THE SALT AND SUPERPOLYAMIDE, HEATING THE SUSPENSION TO A TEMPERATURE SUFFICIENTLY HIGH TO LIBERATE WATER BUT BELOW THE MELTING POINT OF THE SALT, CONTINUING SAID HEATING UNTIL ABOUT 50% TO 70% OF THE THEORETICAL AMOUNT OF WATER OF CONDENSATION HAS BEEN EVOLVED, THEREAFTER GRADUALLY RAISING THE TEMPERATURE UP TO A POINT AT LEAST ABOUT 10*C. BELOW THE MELTING POINT OF THE POLYMER TO LIBERATE MORE WATER AND RECOVERING FREE-FLOWING POLYMER, THE BOILING POINT OF THE NON-SOLVENT BEING SUFFICIENTLY HIGH SO THAT SUBSTANTIALLY ALL OF IT IS RETAINED DURING THE COURSE OF THE REACTION.
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) | 1964-06-05 | 1964-12-05 | 1965-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-06-05 | 1968-12-05 | 1969-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-06-05 | 1972-12-05 | 1973-06-06 | $7700.00 | Window Closed / Lapsed |