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US3493319A
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Esterification of cellulosic textiles with unsaturated long chain fatty acids in the presence of trifluoroacetic anhydride using controlled cellulose-acid-anhydride ratios
Assignee: United States Department of Agriculture
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Filing: 1967-05-26
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Granted: 1970-02-03
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Expires: 1987-05-26
Abstract
No abstract record available.
Inventors
- 👤 Ralph J Berni
- 👤 Ruth R Benerito
- 👤 John B Mckelvey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 13:50
CPC Classifications
D; D06; D06M; D06M13/00; D06M13/10; D06M13/184; D06M13/207; D06M13/21; D06M13/213; D06M13/203; 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) | 1973-02-02 | 1973-08-04 | 1974-02-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-02-02 | 1977-08-04 | 1978-02-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-02-02 | 1981-08-04 | 1982-02-03 | $7700.00 | Window Closed / Lapsed |