Patent US3393968A successfully refreshed from Google Patents.
US3393968A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cellulose reacted with ethyleneimine in the presence of glacial acetic acid
Assignee: United States Department of Agriculture
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Filing: 1964-06-08
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Granted: 1968-07-23
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Expires: 1984-06-08
Abstract
No abstract record available.
Inventors
- 👤 Segal Leon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:46
CPC Classifications
D; D06; D06P; D06P5/00; D06P5/22; D06P5/225; B; B01; B01J; B01J39/00; B01J39/08; B01J39/16; B01J39/18; B01J39/22; D06M; D06M13/00; D06M13/322; D06M13/487; D06P1/00; D06P1/44; D06P1/64; D06P1/642; D06P1/6426
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2972606A
Cited
US2925317A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-07-23 | 1972-01-22 | 1972-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-07-23 | 1976-01-22 | 1976-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-07-23 | 1980-01-22 | 1980-07-23 | $7700.00 | Window Closed / Lapsed |