US3405099A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymerization of pyrrolidone employing halides of group iv elements as chain initiators
Assignee: GAF Corp
•
Filing: 1958-04-04
•
Granted: 1968-10-08
•
Expires: 1978-04-04
Abstract
No abstract record available.
Inventors
- 👤 Taber David
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:30
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/02; C08G69/08; C08G69/14; C08G69/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
61 words
IN THE PROCESS OF POLYMERIZING PYRROLIDONE UNDER ANHYDROUS CONDITIONS IN THE PRESENCE OF A MINOR AMOUNT UP TO ABOUT 10 MOLE PERCENT BASED ON SAID PYRROLIDONE OF AN ALKALI METAL PYRROLIDONE AS THE POLYMERIZATION CATALYST; THE IMPROVEMENT COMPRISING EFFECTING THE POLYMERIZATION IN THE PRESENCE OF A MINOR AMOUNT UP TO ABOUT 10 MOLE PERCENT BASED ON SAID PYRROLIDONE OF CARBON TETRACHLORIDE.
Claim 2
Dependent Claim
61 words
IN THE PROCESS OF POLYMERIZING PYRROLIDONE UNDER ANHYDROUS CONDITIONS IN THE PRESENCE OF A MINOR AMOUNT UP TO ABOUT 10 MOLE PERCENT BASED ON SAID PYRROLIDONE OF AN ALKALI METAL PYRROLIDONE AS THE POLYMERIZATION CATALYST; THE IMPROVEMENT COMPRISING EFFECTING THE POLYMERIZATION IN THE PRESENCE OF A MINOR AMOUNT UP TO ABOUT 10 MOLE PERCENT BASED ON SAID PYRROLIDONE OF CARBON TETRACHLORIDE.
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) | 1971-10-08 | 1972-04-08 | 1972-10-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-10-08 | 1976-04-08 | 1976-10-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-10-08 | 1980-04-08 | 1980-10-08 | $7700.00 | Window Closed / Lapsed |