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Patent US3450755A successfully refreshed from Google Patents.
US3450755A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Perfluoroalkyl sulfonamides and carboxamides
Assignee: 3M Co
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Filing: 1967-02-23
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Granted: 1969-06-17
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Expires: 1987-02-23
Abstract
No abstract record available.
Inventors
- 👤 Arthur H Ahlbrecht
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:58
CPC Classifications
C; C07; C07D; C07D265/00; C07D265/28; C07D265/30; C08; C08G; C08G59/00; C08G59/18; C08G59/40; C08G59/44; C08G59/444
Claims Analysis
Total Claims: 0
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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) | 1972-06-16 | 1972-12-16 | 1973-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-06-16 | 1976-12-16 | 1977-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-06-16 | 1980-12-16 | 1981-06-17 | $7700.00 | Window Closed / Lapsed |