US2922819A
Expired / Lapsed
US
⏱️ 0.0 years remaining
O-phenylene-bis-(dialkylphosphines)
Assignee: Imperial Chemical Industries Ltd
•
Filing: 1959-03-05
•
Granted: 1960-01-26
•
Expires: 1979-03-05
Abstract
No abstract record available.
Inventors
- 👤 Chatt Joseph
- 👤 Hart Frank Alan
- 👤 Fielding Harold Crosbie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:53
CPC Classifications
C; C04; C04B; C04B41/00; C04B41/009; C04B41/45; C04B41/50; C04B41/51; C04B41/80; C04B41/81; C04B41/85; C04B41/88; C07; C07F; C07F9/00; C07F9/02; C07F9/28; C07F9/50; C07F9/5027; C07F9/505; C07F9/5059
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
6 words
O-PHENYLENE BIS-(DIALKYLPHOSPHINES) HAVING THE GENERAL FORMULA
Claim 2
Dependent Claim
6 words
O-PHENYLENE BIS-(DIALKYLPHOSPHINES) HAVING THE GENERAL FORMULA
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) | 1963-01-25 | 1963-07-27 | 1964-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-01-25 | 1967-07-27 | 1968-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-01-25 | 1971-07-27 | 1972-01-26 | $7700.00 | Window Closed / Lapsed |