Patent US3663729A successfully refreshed from Google Patents.
US3663729A
Expired / Lapsed
US
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Process for preparing 4-oxaphosphorinanes
Assignee: BASF SE
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Filing: 1969-12-17
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Granted: 1972-05-16
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Expires: 1989-12-17
Abstract
Abstract WHERE R DENOTES AN ALIPHATIC RADICAL HAVING ONE TO TWENTY CARBON ATOMS AND A PROCESS FOR THE PRODUCTION OF THE SAME WHICH COMPRISES REACTION A DIVINYL ETHER WITH HYDROGEN PHOSPHIDE OR A MONOSUBSTITUTED ORGANIC PHOSPHINE IN THE PRESENCE OF ACTINIC LIGHT OR A SUBSTANCE WHICH DECOMPOSES INTO FREE RADICALS UNDER THE REACTION CONDITIONS AND ALSO IN THE PRESENCE OF A SOLVENT WHICH IS INERT UNDER THE REACTION CONDITIONS. THE PRODUCTS ARE SUITABLE AS MODIFYING AGENTS FOR COBALT CARBONYL COMPLEXES. 4-R-1,4-OXAPHOSPHORINANE A PROCESS FOR PREPARING 4-OXAPHOSPHORINANES HAVING THE GENERAL FORMULA:
Inventors
- 👤 Peter Tavs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 07:40
CPC Classifications
C; C07; C07F; C07F9/00; C07F9/02; C07F9/547; C07F9/6564; C07F9/6571; C07F9/657163; C07F9/6568; C07F9/65683
Claims Analysis
Total Claims: 0
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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) | 1975-05-16 | 1975-11-15 | 1976-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-16 | 1979-11-15 | 1980-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-16 | 1983-11-15 | 1984-05-16 | $7700.00 | Window Closed / Lapsed |