Patent US4837170A successfully refreshed from Google Patents.
US3663514A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Light-stable polyurethane coatings
Assignee: Phillips Petroleum Co
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Filing: 1970-04-09
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Granted: 1972-05-16
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Expires: 1990-04-09
Abstract
Abstract A POLYOL IS REACTED WITH A DIIOSCYANATO TO PRODUCE A FIRST COMPOUND HAVING AVAILABLE FOR FURTHER REACTION UNREACTED ISOCYANATE GROUPS. THE FIRST COMPOUND IS CURED TO PRODUCE A POLYURETHANE COMPOUND HAVING IMPROVED LIGHT STABILITY. THE DIISOCYANATE USEFUL IN THIS INVENTION IS REPRESENTED BY THE FORMULA: OCH-R1-R2-R3-NCO WHEREIN THE -NCO GROUP ATTACHED TO R1 IS MORE REACTIVE THAN THE -NCO GROUP ATTACHED TO R3 AND T1 IS AN AROMATIC GROUP, R2 IS AN ALIPHATIC GROUP OR A DIRECT BOND, AND R3 IS A 1,4-CYCLOHEXYLENE GROUP.
Inventors
- 👤 Robert W Campbell
- 👤 Ralph P Williams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:33
CPC Classifications
C; C07; C07C; C07C265/00; C07C265/12; C08; C08G; C08G18/00; C08G18/06; C08G18/70; C08G18/72; C08G18/74; C08G18/76; C08G18/80; C08G18/8003; C08G18/8006; C08G18/8009; C08G18/8035; Y; Y10; Y10S; Y10S528/00; Y10S528/903
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) | 1975-05-16 | 1975-11-15 | 1976-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-16 | 1979-11-15 | 1980-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-16 | 1983-11-15 | 1984-05-16 | $7700.00 | Window Closed / Lapsed |