US3213066A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymerization of 2-pyrrolidone to granular polymer
Assignee: GAF Chemicals Corp
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Filing: 1962-02-16
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Granted: 1965-10-19
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Expires: 1982-02-16
Abstract
No abstract record available.
Inventors
- 👤 Jr Edgar Earl Renfrew
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:38
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/02; C08G69/08; C08G69/14; C08G69/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
103 words
IN A PROCESS FOR PRODUCING POLYPYRROLIDONE BY THE POLYMERIZATION OF 2-PYRROLIDONE IN THE PRESENCE OF AN ALKALI METAL PYRROLIDONE CATALYST AND A CHAIN-GROWTH INITIATOR SELECTED FROM THE GROUP CONSISTING OF 1-ACETYL-2-PYRROLIDONE, BENZOYL CHLORIDE, N,N''-ADIPYL-DIPYRROLIDONE, DODECYLTRICHLOROSILANE, SILICON TETRACHLORIDE, TITANIUM TETRACHLORIDE, AND CYANURIC CHLORIDE, THE IMPROVEMENT WHICH COMPRISES CARRYING OUT THE POLYMERIZATION WHILE AGITATING THE REACTION MIXTURE IN A ROTATING VESSEL PARTY FILLED WITH FREELY MOVEABLE SPHERES OF A SOLID INERT MATERIAL HAVING A DIAMETER IN THE RANGE OF FROM ABOUT 3/8 TO ABOUT 5/8 INCH TO PROVIDE A GRANULAR POLYPYRROLIDONE PRODUCT, AND SEPARATING THE POLYPYRROLIDONE PRODUCE FROM THE REACTION MIXTURE AND SAID INERT SPHERES.
Claim 2
Dependent Claim
103 words
IN A PROCESS FOR PRODUCING POLYPYRROLIDONE BY THE POLYMERIZATION OF 2-PYRROLIDONE IN THE PRESENCE OF AN ALKALI METAL PYRROLIDONE CATALYST AND A CHAIN-GROWTH INITIATOR SELECTED FROM THE GROUP CONSISTING OF 1-ACETYL-2-PYRROLIDONE, BENZOYL CHLORIDE, N,N''-ADIPYL-DIPYRROLIDONE, DODECYLTRICHLOROSILANE, SILICON TETRACHLORIDE, TITANIUM TETRACHLORIDE, AND CYANURIC CHLORIDE, THE IMPROVEMENT WHICH COMPRISES CARRYING OUT THE POLYMERIZATION WHILE AGITATING THE REACTION MIXTURE IN A ROTATING VESSEL PARTY FILLED WITH FREELY MOVEABLE SPHERES OF A SOLID INERT MATERIAL HAVING A DIAMETER IN THE RANGE OF FROM ABOUT 3/8 TO ABOUT 5/8 INCH TO PROVIDE A GRANULAR POLYPYRROLIDONE PRODUCT, AND SEPARATING THE POLYPYRROLIDONE PRODUCE FROM THE REACTION MIXTURE AND SAID INERT SPHERES.
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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) | 1968-10-18 | 1969-04-19 | 1969-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-10-18 | 1973-04-19 | 1973-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-10-18 | 1977-04-19 | 1977-10-19 | $7700.00 | Window Closed / Lapsed |