US3666781A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of isopropenyl stearate
Assignee: United States Department of Agriculture
•
Filing: 1969-05-07
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Granted: 1972-05-30
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Expires: 1989-05-07
Abstract
Abstract Stearic acid undergoes direct addition of propyne at 160* C. in the presence of zinc stearate catalyst in an inert atmosphere at a pressure of 500 pounds per square inch to form isopropenyl stearate.
Inventors
- 👤 Samuel Serota
- 👤 Edward S Rothman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 18:04
CPC Classifications
C; C07; C07C; C07C67/00; C07C67/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
24 words
The process of claim 1 in which a mixture of fatty acids derived from saponified vegetable oils is used in place of stearic acid.
Claim 2
Dependent Claim
24 words
The process of claim 1 in which a mixture of fatty acids derived from saponified animal oils is used in place of stearic acid.
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) | 1975-05-30 | 1975-11-29 | 1976-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-30 | 1979-11-29 | 1980-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-30 | 1983-11-29 | 1984-05-30 | $7700.00 | Window Closed / Lapsed |