Patent US2915554A successfully refreshed from Google Patents.
US2915554A
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Non-ionic surfactant derivatives of perfluoro alkane-sulfonamides
Assignee: 3M Co
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Filing: 1957-07-23
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Granted: 1959-12-01
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Expires: 1977-07-23
Abstract
No abstract record available.
Inventors
- 👤 Arthur H Ahlbrecht
- 👤 Duane E Morin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:20
CPC Classifications
C; C11; C11D; C11D1/00; C11D1/004; C07; C07C; C07C311/00; C07C311/01; C07C311/02; C07C311/09; C09; C09K; C09K23/00; C09K23/26; Y; Y10; Y10S; Y10S516/00; Y10S516/01; Y10S516/03; Y10S516/05; Y10S8/00; Y10S8/907
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
6 words
A COMPOUND REPRESENTED BY THE FORMULA:
Claim 2
Dependent Claim
6 words
A COMPOUND REPRESENTED BY THE FORMULA:
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) | 1962-11-30 | 1963-06-01 | 1963-12-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-11-30 | 1967-06-01 | 1967-12-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-11-30 | 1971-06-01 | 1971-12-01 | $7700.00 | Window Closed / Lapsed |