US3635908A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of preparing polyurethane-urea thermoplastic products base on a polyamine carbamate as chain extender
Assignee: BASF Corp
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Filing: 1969-11-10
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Granted: 1972-01-18
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Expires: 1989-11-10
Abstract
Abstract THE SUBJECT MATTER OF THE PRESENT APPLICATION RELATES TO POLYURETHANE- UREA COMPOSITIONS. AS DISCLOSED HEREIN, THE POLYURETHANE- UREA COMPOSITONS ARE PREPARED BY HEATING A COMPOSITON WHICH COMRPISES (A) POLYAMINE CARBAMATE AND EITHER (B) ORGANIC POLYISOCYANATE AND (C) ORGANIC COMPOUND CONTAINING AT LEAST TWO ACTIVE HYDROXYL GROUPS OR (D) ISOCYTANATE-TERMINATED INTERMEDIATE PREPARED BY THE REACTION OF (B) AND (C). THE POLYAMINE CARBAMATE EMPLOYED IN THESE COMPOSITION ACTS AS A CHAIN-EXTENDING AGENT AND MAY ACT AS A FOAMING OR BLOWING AGENT, THEREBY PROVIDING FOR UNITARY COMPOSITIONS FOR PREPARATION OF POLYURETHANE-UREAS WHICH ARE STABLE AT ROOM TEMPERATURE.
Inventors
- 👤 Herwart C Vogt
- 👤 George Roley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:29
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/65; C08G18/6505; C08G18/6523; C08G18/6529; C08G18/08; C08G18/10; C08G18/30; C08G18/32; C08G18/3225; C08G18/3253; C08G18/3259; C08G18/3265
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-17 | 1975-07-19 | 1976-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-17 | 1979-07-19 | 1980-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-17 | 1983-07-19 | 1984-01-18 | $7700.00 | Window Closed / Lapsed |