US3752786A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyurethane polyureas
Assignee: USM Corp
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Filing: 1971-11-05
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Granted: 1973-08-14
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Expires: 1991-11-05
Abstract
Abstract THE METHOD OF MAKING SOLVENT SOLUBLE POLYURETHANE POLYUREAS BY MIXING A SOLUTION IN A NON-REACTIVE SOLVENT OF -NCO TERMINATED PREPOLYMER WITH A SOLUTION OF A DIAMINE REACTIVE TO CHAIN EXTEND THE PREPOLYMER IN A SOLVENT MIXTURE INCLUDING A LOWER ALIPHATIC ALCOHOL.
Inventors
- 👤 C Rossitto
- 👤 D Taylor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:08
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/10; C08G18/0838; C08G18/0842; C08G18/0847; C08G18/0852
Claims Analysis
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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) | 1976-08-13 | 1977-02-12 | 1977-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-13 | 1981-02-12 | 1981-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-13 | 1985-02-12 | 1985-08-14 | $7700.00 | Window Closed / Lapsed |