US2992881A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for production of perfluoroalkanoyl esters of cellulose
Assignee: Individual
•
Filing: 1959-07-06
•
Granted: 1961-07-18
•
Expires: 1979-07-06
Abstract
No abstract record available.
Inventors
- 👤 Ralph J Berni
- 👤 Thomas F Fagley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:42
CPC Classifications
D; D06; D06M; D06M13/00; D06M13/10; D06M13/184; D06M13/207; D06M13/21; D06M13/213; C; C08; C08B; C08B3/00; C08B3/14; D06M13/224; D06M13/236
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-07-17 | 1965-01-16 | 1965-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-07-17 | 1969-01-16 | 1969-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-07-17 | 1973-01-16 | 1973-07-18 | $7700.00 | Window Closed / Lapsed |