US3136780A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vapor phase ammonolysis of butyrolactone in the presence of an aluminum silicate clay catalyst
Assignee: FMC Corp
•
Filing: 1961-12-12
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Granted: 1964-06-09
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Expires: 1981-12-12
Abstract
No abstract record available.
Inventors
- 👤 John M Kolyer
- 👤 William B Tuemmler
- 👤 Hsiang P Liao
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:10
CPC Classifications
C; C07; C07D; C07D201/00; C07D201/02; C07D201/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
35 words
IN THE PROCESS OF PREPARING PYRROLIDONE BY THE VAPOR PHASE REACTION OF BUTYROLACTONE AND AMMONIA, THE IMPROVEMENT WHICH COMPRISES CONDUCTING THE REACTION IN THE PRESENCE OF AN ALUMINUM SILICATE CLAY CATALYST AT TEMPERATURES OF 200-400*C.
Claim 2
Dependent Claim
35 words
IN THE PROCESS OF PREPARING PYRROLIDONE BY THE VAPOR PHASE REACTION OF BUTYROLACTONE AND AMMONIA, THE IMPROVEMENT WHICH COMPRISES CONDUCTING THE REACTION IN THE PRESENCE OF AN ALUMINUM SILICATE CLAY CATALYST AT TEMPERATURES OF 200-400*C.
References Cited (Backward Citations)
US2267757A
Cited
GB821982A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-06-09 | 1967-12-09 | 1968-06-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-06-09 | 1971-12-09 | 1972-06-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-06-09 | 1975-12-09 | 1976-06-09 | $7700.00 | Window Closed / Lapsed |