US3657348A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Disubstituted cyclopropenones and method of production
Assignee: Dow Chemical Co
•
Filing: 1968-05-03
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Granted: 1972-04-18
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Expires: 1988-05-03
Abstract
Abstract NEW DISUBSTITUTED CYCLOPROPENONES AND NEW METHOD OF PREPARING SAID CYCLOPROPENONES COMPRISING REACTING A HALOCYCLOPROPENIUM LEWIS ACID SALT WITH A SUBSTITUTED OLEFIN CONTAINING A CARBON TO CARBON DOUBLE BOND WHEREIN ONE TERMINAL CARBON ATOM OF THE DOUBLE BOND IS STERICALLY ACCESSIBLE TO ATTACK BY THE CYCLOPROPENIUM ION, AND THE OTHER TERMINAL CARBON ATOM OF THE DOUBLE BOND BEARS SUBSTITUENTS CONTRIBUTING TO THE FORMATION OF A STABLE CARBONIUM ION.
Inventors
- 👤 Stephen W Tobey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 08:36
CPC Classifications
C; C07; C07C; C07C49/00; C07C49/587; C07C49/687; C07C49/693; C07C49/647; Y; Y10; Y10S; Y10S260/00; Y10S260/14; Y10S260/38
Claims Analysis
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-04-18 | 1975-10-18 | 1976-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-18 | 1979-10-18 | 1980-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-18 | 1983-10-18 | 1984-04-18 | $7700.00 | Window Closed / Lapsed |