US2678869A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cellulose derivatives
Assignee: Bayer AG
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Filing: 1950-12-27
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Granted: 1954-05-18
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Expires: 1970-12-27
Abstract
No abstract record available.
Inventors
- 👤 Schnell Hermann
- 👤 Rinke Heinrich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:47
CPC Classifications
C; C08; C08B; C08B15/00; C08B15/05; C08B15/06; D; D01; D01F; D01F2/00; D01F2/24; D01F2/28
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
72 words
A PROCESS WHICH COMPRISES DISSOLVING AN ORGANIC CELLULOSE DERIVATIVE SELECTED FROM THE GROUP CONSISTING OF CELLULOSE ESTERS, CELLULOSE ETHERS AND CELLULOSE ETHER-ESTER IN AN ORGANIC SOLVENT THEREFOR, ADDING TO THE SOLUTION THUS FORMED AN ADDITION PRODUCT OF A MONOFUNCTIONAL ORGNAIC ISOCYANATE AND HYDROCYANIC ACID, EVAPORATING SAID SOLVENT AND SIMULTANEOUSLY SHAPING AN ARTICLE FROM SAID CELLULOSE DERIVATIVE SOLUTION, AND HEATING SAID SHAPED ARTICLE TO A TEMPERATURE OF FROM ABOUT 100 TO 160* C.
Claim 2
Dependent Claim
72 words
A PROCESS WHICH COMPRISES DISSOLVING AN ORGANIC CELLULOSE DERIVATIVE SELECTED FROM THE GROUP CONSISTING OF CELLULOSE ESTERS, CELLULOSE ETHERS AND CELLULOSE ETHER-ESTER IN AN ORGANIC SOLVENT THEREFOR, ADDING TO THE SOLUTION THUS FORMED AN ADDITION PRODUCT OF A MONOFUNCTIONAL ORGNAIC ISOCYANATE AND HYDROCYANIC ACID, EVAPORATING SAID SOLVENT AND SIMULTANEOUSLY SHAPING AN ARTICLE FROM SAID CELLULOSE DERIVATIVE SOLUTION, AND HEATING SAID SHAPED ARTICLE TO A TEMPERATURE OF FROM ABOUT 100 TO 160* C.
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) | 1957-05-17 | 1957-11-16 | 1958-05-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-05-17 | 1961-11-16 | 1962-05-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-05-17 | 1965-11-16 | 1966-05-18 | $7700.00 | Window Closed / Lapsed |