US2623867A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of polyurea-urethanes
Assignee: Celanese Corp
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Filing: 1949-09-14
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Granted: 1952-12-30
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Expires: 1969-09-14
Abstract
No abstract record available.
Inventors
- 👤 Bonard Claude
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 12:37
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/70; C08G18/701; C08G18/28; C08G18/30; C08G18/32; C08G18/72; C08G18/80; C08G18/8061; C08G18/8064; C08G18/8067
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
39 words
PROCESS FOR THE PRODUCTION OF POLYMERS, WHICH COMPRISES REACTING A DIURETHANE HAVING THE FORMULA C6H5O.OC.NH-R''-NH.CO.OC6H5 IN WHICH R'' IS A POLYMETHYLENE RADICLE, WITH A SUBSTANTIALLY EQUIMOLECULAR PROPORTION OF MONOETHANOLAMINE, AND CONTINUING THE REACTION UNTIL A FILAMENT-FORMING POLYMER IS PRODUCED.
Claim 2
Dependent Claim
39 words
PROCESS FOR THE PRODUCTION OF POLYMERS, WHICH COMPRISES REACTING A DIURETHANE HAVING THE FORMULA C6H5O.OC.NH-R''-NH.CO.OC6H5 IN WHICH R'' IS A POLYMETHYLENE RADICLE, WITH A SUBSTANTIALLY EQUIMOLECULAR PROPORTION OF MONOETHANOLAMINE, AND CONTINUING THE REACTION UNTIL A FILAMENT-FORMING POLYMER IS PRODUCED.
References Cited (Backward Citations)
US2343808A
Cited
FR888700A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-12-30 | 1956-06-30 | 1956-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-12-30 | 1960-06-30 | 1960-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-12-30 | 1964-06-30 | 1964-12-30 | $7700.00 | Window Closed / Lapsed |