Patent US3413546A successfully refreshed from Google Patents.
Patent US3776877A successfully refreshed from Google Patents.
US3776877A
Expired / Lapsed
US
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Method of producing extruded thermoset polyurethanes
Assignee: THURON IND INC US
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Filing: 1971-07-23
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Granted: 1973-12-04
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Expires: 1991-07-23
Abstract
Abstract THE PROCESS OF PRODUCING AN EXTRUDED THERMOSETTING RESIN HAVING A URETHANE LINKAGE COMPRISING: FORMING A MIXTURE IN REACTIVE PROPORTIONS OF A DIISOCYANATE AND A POLYMER HAVING REACTIVE HYDROXYL GROUPS, THE MIXTURE BEING CAPABLE OF BEING EXTRUDED, REACTING THE DIISOCYANATE AND THE POLYMER TO FORM SAID URETHANE LINKAGES, EXTRUDING SAID MIXTURES WHILE EXTRUABLE, AND PRIOR TO THE COMPLETION OF THE REACTION, INTO A PREDETERMINED FORM AND PERMITTING THE REACTION TO COMPLETE TO PRODUCE A THERMOSETTING RESIN.
Inventors
- 👤 R Winslow
- 👤 C Coppock
- 👤 D Kelley
- 👤 J White
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:59
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/0895; C08G18/28; C08G18/40; C08G18/62; C08G18/6212
Claims Analysis
Total Claims: 0
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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) | 1976-12-03 | 1977-06-04 | 1977-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-03 | 1981-06-04 | 1981-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-03 | 1985-06-04 | 1985-12-04 | $7700.00 | Window Closed / Lapsed |