Patent US2809990A successfully refreshed from Google Patents.
US2809990A
Expired / Lapsed
US
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Fluorocarbon acids and derivatives
Assignee: 3M Co
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Filing: 1955-12-29
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Granted: 1957-10-15
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Expires: 1975-12-29
Abstract
No abstract record available.
Inventors
- 👤 Harvey A Brown
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:19
CPC Classifications
C; C07; C07C; C07C323/00; C07C323/50; C07C323/51; C07C323/57; C07C323/58; C07C309/00; C07C309/01; C07C309/02; C07C309/03; C07C309/07; C07C309/09; C07C309/10; C07C53/00; C07C53/15; C07C53/19
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
18 words
THE NEW AND USEFUL FLUOROCARBON COMPOUNDS OF THE CLASS CONSISTING OF THE PERFLUOROALKANESULFONAMIDO ALKYLENEMONOCARBOXYLIC ACIDS HAVING THE FORMULA:
Claim 2
Dependent Claim
18 words
THE NEW AND USEFUL FLUOROCARBON COMPOUNDS OF THE CLASS CONSISTING OF THE PERFLUOROALKANESULFONAMIDO ALKYLENEMONOCARBOXYLIC ACIDS HAVING THE FORMULA:
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-10-14 | 1961-04-15 | 1961-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-10-14 | 1965-04-15 | 1965-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-10-14 | 1969-04-15 | 1969-10-15 | $7700.00 | Window Closed / Lapsed |