Patent US2500256A successfully refreshed from Google Patents.
US2500256A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of nitriles
Assignee: Phillips Petroleum Co
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Filing: 1944-12-11
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Granted: 1950-03-14
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Expires: 1964-12-11
Abstract
No abstract record available.
Inventors
- 👤 John E Mahan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 10:49
CPC Classifications
C; C07; C07C; C07C255/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
47 words
A PROCESS FOR THE PRODUCTION OF ALIPHATIC NITRILE WHICH COMPRISES REACTING A TERTIARY OLEFIN OXIDE WITH AMMONIA IN VAPOR PHASE AT A TEMPERATURE WITHIN THE RANGE OF 600 TO 1000*F. AND AT A PRESSURE WITHIN THE RANGE OF SUBATMOSPHERIC TO ABOUT 100 POUNDS PER SQUARE INCH GAGE.
Claim 2
Dependent Claim
47 words
A PROCESS FOR THE PRODUCTION OF ALIPHATIC NITRILE WHICH COMPRISES REACTING A TERTIARY OLEFIN OXIDE WITH AMMONIA IN VAPOR PHASE AT A TEMPERATURE WITHIN THE RANGE OF 600 TO 1000*F. AND AT A PRESSURE WITHIN THE RANGE OF SUBATMOSPHERIC TO ABOUT 100 POUNDS PER SQUARE INCH GAGE.
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) | 1953-03-13 | 1953-09-12 | 1954-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-03-13 | 1957-09-12 | 1958-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-03-13 | 1961-09-12 | 1962-03-14 | $7700.00 | Window Closed / Lapsed |