US3435076A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tricyclic phosphines and the preparation thereof
Assignee: Shell USA Inc
•
Filing: 1966-07-19
•
Granted: 1969-03-25
•
Expires: 1986-07-19
Abstract
No abstract record available.
Inventors
- 👤 Ronald F Mason
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:52
CPC Classifications
C; C07; C07F; C07F9/00; C07F9/02; C07F9/547; C07F9/6564; C07F9/6568; C07F9/65683
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
47 words
13-MONOPHOSPHATRICYCLOTRIDECANES, HAVING 12 TO 15 CARBON ATOMS, 12 CARBON ATOMS THEREOF TOGETHER WITH THE PHOSPHORUS ATOM BEING MEMBERS OF THE TRICYCLIC SKELETAL STRUCTURE, INWHICH THE SMALLEST PHOSPHORUS-CONTAINING RING CONTAINS AT LEAST 5 ATOMS AND THE PHOSPHORUS ATOM THEREIN IS A MEMBER OF EACH OF THE THREE RINGS.
Claim 2
Dependent Claim
47 words
13-MONOPHOSPHATRICYCLOTRIDECANES, HAVING 12 TO 15 CARBON ATOMS, 12 CARBON ATOMS THEREOF TOGETHER WITH THE PHOSPHORUS ATOM BEING MEMBERS OF THE TRICYCLIC SKELETAL STRUCTURE, INWHICH THE SMALLEST PHOSPHORUS-CONTAINING RING CONTAINS AT LEAST 5 ATOMS AND THE PHOSPHORUS ATOM THEREIN IS A MEMBER OF EACH OF THE THREE RINGS.
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) | 1972-03-24 | 1972-09-23 | 1973-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-03-24 | 1976-09-23 | 1977-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-03-24 | 1980-09-23 | 1981-03-25 | $7700.00 | Window Closed / Lapsed |