Patent US2803597A successfully refreshed from Google Patents.
US2803597A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing organic phosphines
Assignee: Shell Development Co
•
Filing: 1949-04-30
•
Granted: 1957-08-20
•
Expires: 1969-04-30
Abstract
No abstract record available.
Inventors
- 👤 Alan R Stiles
- 👤 Frederick F Rust
- 👤 William E Vaughan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 06:46
CPC Classifications
C; C07; C07F; C07F9/00; C07F9/02; C07F9/28; C07F9/50; C07F9/505; C07F9/5059; Y; Y10; Y10S; Y10S204/00; Y10S204/902; Y10S204/912
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
35 words
A PROCESS FOR THE PRODUCTION OF HYDROCARBON PHOSPHINES, WHICH COMPRISES, HEATING A LIQUID MIXTURE OF PHOSPHINE, 1-BUTENE AND FROM 1 TO 10 MOLE PERCENT OF DI-TERTIARY-BUTYL PEROXIDE TO A TEMPERATURE OF FROM 110 TO 150*C.
Claim 2
Dependent Claim
35 words
A PROCESS FOR THE PRODUCTION OF HYDROCARBON PHOSPHINES, WHICH COMPRISES, HEATING A LIQUID MIXTURE OF PHOSPHINE, 1-BUTENE AND FROM 1 TO 10 MOLE PERCENT OF DI-TERTIARY-BUTYL PEROXIDE TO A TEMPERATURE OF FROM 110 TO 150*C.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-08-19 | 1961-02-18 | 1961-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-08-19 | 1965-02-18 | 1965-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-08-19 | 1969-02-18 | 1969-08-20 | $7700.00 | Window Closed / Lapsed |