US2500403A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of olefinic nitriles
Assignee: Wyeth Holdings LLC
•
Filing: 1945-09-01
•
Granted: 1950-03-14
•
Expires: 1965-09-01
Abstract
No abstract record available.
Inventors
- 👤 Harold S Davis
- 👤 Erwin L Carpenter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 02:29
CPC Classifications
C; C07; C07C; C07C253/00; C07C253/30
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
46 words
A METHOD OF MAKING AN OLEFINIC NITRILE WHICH INCLUDES THE STEPS OF HEATING THE CORRESPONDING ALKYLENE CYANOHYDRIN IN THE PRESENCE OF A SUFFICIENT AMOUNT OF A CATALYST COMPRISING AN ALKALI FORMING METAL COMPOUND HAVING AN ALKALINE REACTION SO AS TO CAUSE DEHYDRATION OF THE ALKYLENE CYANOHYDRIN.
Claim 2
Independent Claim
46 words
A METHOD OF MAKING AN OLEFINIC NITRILE WHICH INCLUDES THE STEPS OF HEATING THE CORRESPONDING ALKYLENE CYANOHYDRIN IN THE PRESENCE OF A SUFFICIENT AMOUNT OF A CATALYST COMPRISING AN ALKALI FORMING METAL COMPOUND HAVING AN ALKALINE REACTION SO AS TO CAUSE DEHYDRATION OF THE ALKYLENE CYANOHYDRIN.
References Cited (Backward Citations)
DE496372C
Cited
US1891055A
Cited
GB416007A
Cited
US2374052A
Cited
US2356247A
Cited
US2364422A
Cited
US2392303A
Cited
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 |