Patent US2931803A successfully refreshed from Google Patents.
US2931803A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluorocarbon metalloid compounds of tetrafluoroethylene and sulfur, selenium or phosphorus and their preparation
Assignee: EIDP Inc
•
Filing: 1957-08-15
•
Granted: 1960-04-05
•
Expires: 1977-08-15
Abstract
No abstract record available.
Inventors
- 👤 Carl G Krespan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 07:20
CPC Classifications
C; C07; C07D; C07D495/00; C07D495/02; C07D495/04; C07D329/00; C07D333/00; C07D333/02; C07D333/04; C07D333/26; C07D333/28; C07D339/00; C07D339/08; C07D345/00; C07F; C07F9/00; C07F9/02; C07F9/28; C07F9/50; C07F9/52
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
8 words
A FLUOROCARBON METALLOIDAL HETEROCYCLIC COMPOUND OF THE FORMULA
Claim 2
Dependent Claim
8 words
A FLUOROCARBON SELENIUM HETEROCYCLIC COMPOUND OF THE FORMULA
Claim 3
Dependent Claim
8 words
A FLUOROCARBON PHOSPHORUS HETEROCYCLIC COMPOUND OF THE FORMULA
References Cited (Backward Citations)
US2347182A
Cited
US2410401A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-04-05 | 1963-10-05 | 1964-04-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-04-05 | 1967-10-05 | 1968-04-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-04-05 | 1971-10-05 | 1972-04-05 | $7700.00 | Window Closed / Lapsed |