US3790638A
Expired / Lapsed
US
⏱️ 0.0 years remaining
(hydroxy or alkanoyloxy alkylene)dihydrocarbyl phosphine oxides
Assignee: Hoechst AG
•
Filing: 1971-08-12
•
Granted: 1974-02-05
•
Expires: 1991-08-12
Abstract
Abstract TERTIARY PHOSPHINE OXIDES ARE OBTAINED BY ADDING OLEFINS HAVING A TERMINAL HYDROXY OR AMINO GROUP OR FUNCTIONAL DERIVATIVES THEREOF TO SECONDARY PHOSPHINE OXIDES. THE ADDUCTS ARE USEFUL AS INTERMEDIATES IN THE PREPARATION OF FLAME-RETARDANT AGENTS, ANTI-CORROSIVE AGENTS, PESTICIDES, PHARMACEUTICALS AND DETERGENTS.
Inventors
- 👤 H Kleiner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:55
CPC Classifications
C; C07; C07F; C07F9/00; C07F9/02; C07F9/28; C07F9/50; C07F9/53; C07F9/5304; C07F9/547; C07F9/645; C07F9/6503; C07F9/6506
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1977-02-04 | 1977-08-06 | 1978-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-04 | 1981-08-06 | 1982-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-04 | 1985-08-06 | 1986-02-05 | $7700.00 | Window Closed / Lapsed |