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Patent US3635904A successfully refreshed from Google Patents.
US3635904A
Expired / Lapsed
US
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Process for manufacture of rigid noncellular polyurethane
Assignee: Imperial Chemical Industries Ltd
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Filing: 1970-01-08
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Granted: 1972-01-18
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Expires: 1990-01-08
Abstract
Abstract A PROCESS FOR MANUFACTURE OF SHAPED POLYURETHANE ARTICLES WHICH COMPRISES FORMING AN ANHYDROUS REACTION MIXTURES OF ONE OR MORE ORGAINC POLYISOCYANATES AND ONE OR MORE ORGANIC POLYOLS SUCH AS WILL PROVIDE A RIGID POLYURETHANE ON CURING ALLOWING THE MIXTURE TO CURE TO A GELLED STATE AND SUBJECTING THE MIXTURE TO A FABRICATION STEP PRIOR TO THE MIXTURE REACHING A FULLY CURED STATE.
Inventors
- 👤 Peter James Briggs
- 👤 William Raymond Clegg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 11:44
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/70; C08G18/72; C08G18/721; C08G18/727; C08G18/08; C08G18/28; C08G18/40; C08G18/42; C08G18/4236; C08G18/4238; C08G18/4241; C08G18/48; C08G18/4829; Y; Y10; Y10S; Y10S528/00; Y10S528/903
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) | 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 |