US2946805A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Synthesis of 2-pyrrolidone
Assignee: GAF Chemicals Corp
•
Filing: 1957-05-20
•
Granted: 1960-07-26
•
Expires: 1977-05-20
Abstract
No abstract record available.
Inventors
- 👤 Roger F Kleinschmidt
- 👤 Joseph M Wilkinson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:52
CPC Classifications
C; C07; C07D; C07D201/00; C07D201/02; C07D201/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
25 words
A PROCESS FOR THE PREPARATION OF 2-PYRROLIDONE WHICH COMPRISES REACTING GAMMA-HYDROXYBUTYRAMIDE WITH ANHYDROUS AMMONIA AT ELEVATED TEMPERATURES AND PRESSURES, AND RECOVERING THE THUS PRODUCED 2-PYRROLIDONE.
Claim 2
Dependent Claim
25 words
A PROCESS FOR THE PREPARATION OF 2-PYRROLIDONE WHICH COMPRISES REACTING GAMMA-HYDROXYBUTYRAMIDE WITH ANHYDROUS AMMONIA AT ELEVATED TEMPERATURES AND PRESSURES, AND RECOVERING THE THUS PRODUCED 2-PYRROLIDONE.
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) | 1963-07-26 | 1964-01-25 | 1964-07-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-07-26 | 1968-01-25 | 1968-07-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-07-26 | 1972-01-25 | 1972-07-26 | $7700.00 | Window Closed / Lapsed |