US2877267A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyfluorinated sulfonic acids and derivatives
Assignee: 3M Co
•
Filing: 1956-06-18
•
Granted: 1959-03-10
•
Expires: 1976-06-18
Abstract
No abstract record available.
Inventors
- 👤 Tiers George Van Dyke
- 👤 Robert J Koshar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 11:49
CPC Classifications
C; C07; C07C; C07C309/00; C07C309/01; C07C309/02; C07C309/03; C07C309/06; C07C309/78; C07C309/79; C07C309/80; Y; Y10; Y10S; Y10S516/00; Y10S516/01; Y10S516/03
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
8 words
THE OMEGA-CHLORO-PERFLUORO ALKANESULFONIC ACIDS REPRESENTED BY THE FORMULA
Claim 2
Dependent Claim
8 words
THE OMEGA-CHLORO-PERFLUORO ALKANESULFONIC ACIDS REPRESENTED BY THE FORMULA
References Cited (Backward Citations)
US2276097A
Cited
US2732398A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-03-09 | 1962-09-08 | 1963-03-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-03-09 | 1966-09-08 | 1967-03-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-03-09 | 1970-09-08 | 1971-03-10 | $7700.00 | Window Closed / Lapsed |