Patent US3089870A successfully refreshed from Google Patents.
US3089870A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing nitrogen-containing cellulose derivatives
Assignee: Eastman Kodak Co
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Filing: 1962-01-09
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Granted: 1963-05-14
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Expires: 1982-01-09
Abstract
No abstract record available.
Inventors
- 👤 John W Mench
- 👤 Fulkerson Brazelton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:13
CPC Classifications
C; C08; C08B; C08B13/00; C08B3/00; C08B3/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
51 words
IN A PROCESS FOR REACTING A CELLULOSE DERIVATIVE SELECTED FROM THE GROUP CONSISTING OF CHLOROACYLATED CELLULOSE ESTERS AND CHLOROACYLATED CELLULOSE ETHERS WITH A SECONDARY AMINE, THE IMPROVEMENT WHICH COMPRISES INCORPORATING IN THE REACTION MIXTURE A SALT SELECTED FROM THE GROUP CONSISTING OF SODIUM CARBONATE, SODIUM BICARBONATE, CALCIUM OXIDE AND SODIUM ACETATE.
Claim 2
Dependent Claim
51 words
IN A PROCESS FOR REACTING A CELLULOSE DERIVATIVE SELECTED FROM THE GROUP CONSISTING OF CHLOROACYLATED CELLULOSE ESTERS AND CHLOROACYLATED CELLULOSE ETHERS WITH A SECONDARY AMINE, THE IMPROVEMENT WHICH COMPRISES INCORPORATING IN THE REACTION MIXTURE A SALT SELECTED FROM THE GROUP CONSISTING OF SODIUM CARBONATE, SODIUM BICARBONATE, CALCIUM OXIDE AND SODIUM ACETATE.
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) | 1966-05-13 | 1966-11-12 | 1967-05-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-05-13 | 1970-11-12 | 1971-05-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-05-13 | 1974-11-12 | 1975-05-14 | $7700.00 | Window Closed / Lapsed |