US2598767A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cellulose ester and nu-alkoxymethyl polyurethane reacted polymers
Assignee: Celanese Corp
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Filing: 1950-01-04
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Granted: 1952-06-03
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Expires: 1970-01-04
Abstract
No abstract record available.
Inventors
- 👤 Carl R Dolmetsch
- 👤 Samuel B Mcfarlane
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 12:20
CPC Classifications
D; D06; D06M; D06M15/00; D06M15/19; D06M15/37; D06M15/564; C; C08; C08B; C08B3/00; C08B3/22; D01; D01F; D01F2/00; D01F2/24; D01F2/28; D01F2/30
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
54 words
PROCESS FOR PREPARING POLYMERIC MATERIALS WHICH COMPRISES HEATING AN INTIMATE MIXTURE OF A LOWER ALIPHATIC ACID ESTER OF CELLULOSE CONTAINING AT LEAST ABOUT 0.2 FREE HYDROXYL GROUP PER GLUCOSE UNIT WITH AN N-ALKOXYMETHYL POLYURETHANE AT A TEMPERATURE OF FROM ABOUT 80 TO 150* C. FOR A PERIOD OF FROM ABOUT 1 TO 12 HOURS.
Claim 2
Dependent Claim
54 words
PROCESS FOR PREPARING POLYMERIC MATERIALS WHICH COMPRISES HEATING AN INTIMATE MIXTURE OF A LOWER ALIPHATIC ACID ESTER OF CELLULOSE CONTAINING AT LEAST ABOUT 0.2 FREE HYDROXYL GROUP PER GLUCOSE UNIT WITH AN N-ALKOXYMETHYL POLYURETHANE AT A TEMPERATURE OF FROM ABOUT 80 TO 150* C. FOR A PERIOD OF FROM ABOUT 1 TO 12 HOURS.
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) | 1955-06-03 | 1955-12-03 | 1956-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-06-03 | 1959-12-03 | 1960-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-06-03 | 1963-12-03 | 1964-06-03 | $7700.00 | Window Closed / Lapsed |