US3641024A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low molecular weight polyisocyanates
Assignee: Marathon Oil Co
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Filing: 1968-11-01
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Granted: 1972-02-08
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Expires: 1988-11-01
Abstract
Abstract POLYISOCYANATE PRODUCT MIXTURE COMPOUNDS ARE SEPARATED INTO A RELATIVELY LOW MOLECULAR WEIGHT PHASE AND A RELATIVELY HIGH MOLECULAR WEIGHT PHASE BY CONTACTING THE PRODUCT MIXTURE WITH CARBON TETRACHLORIDE. THE SOLVENT IS READILY REMOVED FOR FINAL ISOLATION OF THE TWO OLYISOCYANATE COMPONENTS. THE POLYISOCYANATE COMOSITIONS ARE USEFUL AS STARTING MATERIALS IN THE PRODUCTION OF URETHANE POLYMERS AS COATINGS, FILMS, FOAMS, ADHESIVES, ETC. THE HIGHER MOLECULARE WEIGHT PRODUCTS ARE ESPECIALLY USEFUL IN THESE AREAS BECAUSE OF THEIR INHERENT THERMOSTABILITY AND FLAME RETARDANCY PROVEDED BY THE HIGH CONCENTRATION OF ISOCYANURATE RINGS IN THE MOLECULE.
Inventors
- 👤 Perry A Argabright
- 👤 Harold D Rider
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:17
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/70; C08G18/72; C08G18/77; C08G18/78; C08G18/79; C08G18/791; C08G18/794; C08G18/02; C08G18/022
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) | 1975-02-07 | 1975-08-09 | 1976-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-07 | 1979-08-09 | 1980-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-07 | 1983-08-09 | 1984-02-08 | $7700.00 | Window Closed / Lapsed |