US2817646A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing lactams and amides
Assignee: Shell Development Co
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Filing: 1955-12-06
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Granted: 1957-12-24
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Expires: 1975-12-06
Abstract
No abstract record available.
Inventors
- 👤 George B Payne
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 01:46
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/02; C08G69/08; C08G69/14; C07; C07D; C07D201/00; C07D201/02; C07D201/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
61 words
A PROCESS WHICH COMPRISES REACTING A LACTONE HAVING 5 TO 8 ATOMS IN ITS RING WITH AN AMMONIA YIELDING COMPOUND SELECTED FROM THE GROUP CONSISTING OF AN AMINE AND AMMONIA, AND WITH HYDROGEN IN THE PRESENCE OF A HYDROGENATION CATLYST AT TEMPERATURES RANGING FROM ABOUT 175*C. TO ABOUT 250*SC. AND A TOTAL PRESSURE FROM ABOUT 100 P.S.I.G. TO ABOUT 600 P.S.I.G.
Claim 2
Dependent Claim
61 words
A PROCESS WHICH COMPRISES REACTING A LACTONE HAVING 5 TO 8 ATOMS IN ITS RING WITH AN AMMONIA YIELDING COMPOUND SELECTED FROM THE GROUP CONSISTING OF AN AMINE AND AMMONIA, AND WITH HYDROGEN IN THE PRESENCE OF A HYDROGENATION CATLYST AT TEMPERATURES RANGING FROM ABOUT 175*C. TO ABOUT 250*SC. AND A TOTAL PRESSURE FROM ABOUT 100 P.S.I.G. TO ABOUT 600 P.S.I.G.
References Cited (Backward Citations)
US2181140A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-12-23 | 1961-06-24 | 1961-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-12-23 | 1965-06-24 | 1965-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-12-23 | 1969-06-24 | 1969-12-24 | $7700.00 | Window Closed / Lapsed |