Patent US3274239A successfully refreshed from Google Patents.
US3274239A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluorocarbon ethers
Assignee: EIDP Inc
•
Filing: 1962-08-31
•
Granted: 1966-09-20
•
Expires: 1982-08-31
Abstract
No abstract record available.
Inventors
- 👤 Selman Stanley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 07:33
CPC Classifications
C; C07; C07C; C07C59/00; C07C59/125; C07C59/135
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
46 words
A FLUOROCARBON ETHER COMPOUND HAVING THE GENERAL FORMULA (-R"F-)>CF-O-(CF(-CF3)-CF2-O)N-CF(-CF3)-CO-Y WHERE R''''F IS A PERFLUOROALKYLENE GROUP OF THREE TO EIGHT CARBONS, N IS AN INTEGER FROM ZERO TO TWENTY INCLUSIVE AND Y IS A GROUP SELCTED FROM THE CLASS CONSISTING OF THE HYDROXYL AND THE FLUORINE GROUP.
Claim 2
Dependent Claim
46 words
A FLUOROCARBON ETHER COMPOUND HAVING THE GENERAL FORMULA (-R"F-)>CF-O-(CF(-CF3)-CF2-O)N-CF(-CF3)-CO-Y WHERE R''''F IS A PERFLUOROALKYLENE GROUP OF THREE TO EIGHT CARBONS, N IS AN INTEGER FROM ZERO TO TWENTY INCLUSIVE AND Y IS A GROUP SELCTED FROM THE CLASS CONSISTING OF THE HYDROXYL AND THE FLUORINE GROUP.
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) | 1969-09-19 | 1970-03-21 | 1970-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-09-19 | 1974-03-21 | 1974-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-09-19 | 1978-03-21 | 1978-09-20 | $7700.00 | Window Closed / Lapsed |