US2739959A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymerization of pyrolidone and piperidone
Assignee: Arnold Hoffman & Co Inc
•
Filing: 1953-02-24
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Granted: 1956-03-27
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Expires: 1973-02-24
Abstract
No abstract record available.
Inventors
- 👤 Jr William O Ney
- 👤 Crowther Milton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:56
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/02; C08G69/08; C08G69/14; C08G69/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
47 words
IN THE POLYMERIZATION OF A LACTAM SELECTED FROM THE GROUP CONSISTING OF PYROLIDONE AND PIPERIDONE IN THE PRESENCE OF AN ALKALINE POLYMERIZATION CATALYST AND AN ACYL GROUP CONTAINING ACTIVATOR THEREFOR, THE IMPROVEMENT COMPRISING CARRYING OUT THE POLYMERIZATION OF SAID LACTAM WHILE DISPERED IN AN ANHYDROUS NON-SOLVENT THEREFOR.
Claim 2
Dependent Claim
47 words
IN THE POLYMERIZATION OF A LACTAM SELECTED FROM THE GROUP CONSISTING OF PYROLIDONE AND PIPERIDONE IN THE PRESENCE OF AN ALKALINE POLYMERIZATION CATALYST AND AN ACYL GROUP CONTAINING ACTIVATOR THEREFOR, THE IMPROVEMENT COMPRISING CARRYING OUT THE POLYMERIZATION OF SAID LACTAM WHILE DISPERED IN AN ANHYDROUS NON-SOLVENT THEREFOR.
References Cited (Backward Citations)
CH263292A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-03-27 | 1959-09-26 | 1960-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-03-27 | 1963-09-26 | 1964-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-03-27 | 1967-09-26 | 1968-03-27 | $7700.00 | Window Closed / Lapsed |