US3780111A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reduction of triphenylphosphine oxide with iron to triphenylphosphine
Assignee: Eastman Kodak Co
•
Filing: 1972-07-28
•
Granted: 1973-12-18
•
Expires: 1992-07-28
Abstract
Abstract A PROCESS FOR REDUCING TRIHYDROCARBON PHOSPHORUS OXIDE TO TRIHYDROCARBON PHOSPHORUS BY REACTING THE TRIHYDROCARBON PHOSPHORUS OXIDE WITH A HALO-COMPLIXING AGENT FORMING AN ADDUCT OF TRIHYDROCAROBN PHOSPHOUS DIHALIDE WITH THE AGENT. THE ADDUCT IS HEATED TO ITS DECOMPOSITION TEMPERATURE IN A HALOBENZENE SOLVENT HAVING A BOILING POINT HIGHER THAN THE DECOMPOSITION TEMPERATURE OF THE ADDUCT TO SEPARATE THE TRIHYDROCARBON PHOSPHORUS DIHALIDE FROM THE COMPLEX. THE DIHYDROCARBON PHOSPHORUS DIHALIDE IS THEN REDUCED WITH IRON FORMING TRIHYDROCARBON PHOSPHORUS.
Inventors
- 👤 D Young
- 👤 K Brannock
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 20:25
CPC Classifications
C; C07; C07F; C07F9/00; C07F9/02; C07F9/28; C07F9/50; C07F9/505; C07F9/509
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) | 1976-12-17 | 1977-06-18 | 1977-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-17 | 1981-06-18 | 1981-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-17 | 1985-06-18 | 1985-12-18 | $7700.00 | Window Closed / Lapsed |