US3346612A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Perfluoroalkane sulfonate esters
Assignee: 3M Co
•
Filing: 1964-07-02
•
Granted: 1967-10-10
•
Expires: 1984-07-02
Abstract
No abstract record available.
Inventors
- 👤 Robert L Hansen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:31
CPC Classifications
C; C07; C07C; C07C309/00; C07C309/63; C07C309/64; C07C309/65
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
5 words
A PERFLUOROALKANESULFONATE OF THE FORMULA
Claim 2
Dependent Claim
5 words
A PERFLUOROALKANESULFONATE OF THE FORMULA
References Cited (Backward Citations)
US2894971A
Cited
US3118945A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-10-09 | 1971-04-10 | 1971-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-10-09 | 1975-04-10 | 1975-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-10-09 | 1979-04-10 | 1979-10-10 | $7700.00 | Window Closed / Lapsed |