US3427296A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of ethylene/vinyl-pyrrolidinone copolymers in the presence of ammonia
Assignee: Gulf Oil Corp
•
Filing: 1965-03-26
•
Granted: 1969-02-11
•
Expires: 1985-03-26
Abstract
No abstract record available.
Inventors
- 👤 Harry D Anspon
- 👤 Richard L Alexander
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:28
CPC Classifications
C; C08; C08L; C08L77/00; C08F; C08F10/00; C08F8/00; C08F8/18; C08F8/20; C08L23/00; C08L23/02; C08L23/04; C08L23/06; C08L39/00; C08L39/04; C08L39/06; C08L2207/00; C08L2207/06; C08L2207/062; C08L2207/066
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
CA636450A
Cited
US2646425A
Cited
US2523705A
Cited
US2900305A
Cited
US2853417A
Cited
GB834160A
Cited
US2982762A
Cited
US3136735A
Cited
US2996488A
Cited
US3073794A
Cited
US3211807A
Cited
US3256364A
Cited
US3296231A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-02-11 | 1972-08-12 | 1973-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-02-11 | 1976-08-12 | 1977-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-02-11 | 1980-08-12 | 1981-02-11 | $7700.00 | Window Closed / Lapsed |