Patent US3339462A successfully refreshed from Google Patents.
Patent US2687437A successfully refreshed from Google Patents.
US2687437A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Organic phosphines, their phosphonium halides and methods for preparation thereof
Assignee: EIDP Inc
•
Filing: 1951-04-20
•
Granted: 1954-08-24
•
Expires: 1971-04-20
Abstract
No abstract record available.
Inventors
- 👤 Alfred L Oppegard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 00:46
CPC Classifications
C; C07; C07F; C07F9/00; C07F9/02; C07F9/28; C07F9/54; C07F9/5435; C07F9/50; C07F9/5018; C07F9/505; C07F9/5407
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
39 words
A PROCESS WHICH COMPRISES HEATING A MIXTURE OF A HYDROCARBON HAVING ONE TO TWO ETHYLENIC DOUBLE BONDS, WHITE PHOSPHORUS AND HYDROGEN AT A TEMPERATURE OF 250* C. TO 400* C. AND UNDER A PRESSURE OF 700 TO 3000 ATMOSPHERES.
Claim 2
Dependent Claim
39 words
A PROCESS WHICH COMPRISES HEATING A MIXTURE OF A HYDROCARBON HAVING ONE TO TWO ETHYLENIC DOUBLE BONDS, WHITE PHOSPHORUS AND HYDROGEN AT A TEMPERATURE OF 250* C. TO 400* C. AND UNDER A PRESSURE OF 700 TO 3000 ATMOSPHERES.
Claim 3
Dependent Claim
16 words
A COMPOUND SELECTED FROM THE CLASS CONSISTING OF TRICYCLOHEXYLPHOSPHINE, TETRACYCLOHEXLYPHOSPHONIUM IODIDE, TRICYCLOHEXYLPHOSPHINE HYDROIODIDE AND TRICYCLOHEXYLMETHYLPHOSPHONIUM IODIDE.
Claim 4
Dependent Claim
16 words
A COMPOUND SELECTED FROM THE CLASS CONSISTING OF TRICYCLOHEXYLPHOSPHINE, TETRACYCLOHEXLYPHOSPHONIUM IODIDE, TRICYCLOHEXYLPHOSPHINE HYDROIODIDE AND TRICYCLOHEXYLMETHYLPHOSPHONIUM IODIDE.
References Cited (Backward Citations)
US2160840A
Cited
US2584112A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-08-23 | 1958-02-22 | 1958-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-08-23 | 1962-02-22 | 1962-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-08-23 | 1966-02-22 | 1966-08-24 | $7700.00 | Window Closed / Lapsed |