Patent US3775427A successfully refreshed from Google Patents.
US3775427A
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US
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Polyisocyanates containing hydantoin groups
Assignee: Novartis AG
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Filing: 1971-10-04
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Granted: 1973-11-27
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Expires: 1991-10-04
Abstract
Abstract POLYISOCYANATES ARE MANUFACTURED BY ADDING 2 MOLS OF A POLYISOCYANATE, SUCH AS ISOPHORONEDIISOCYANATE OR TOLUYLENE-2,4 DIISOCYANATE, ONTO ONE MOL OF A BIS-HYDANTOIN, SUCH AS, FOR EXAMPLE, 1,6-BIS(5,5-DIMETHYLHYDANTOINYL-3)- HEXANE. EXAMPLE: THE NEW DIISOCYANATE OF THE FORMULA ((4-CH3,3-(O=C=N-)PHENYL)-NH-CO-(2,4-DI(O=),5,5-DI(CH3-)- IMIDAZOLIDIN-1,3-YLENE))2-(CH2)6 THESE COMPOUNDS MAY BE USED TO PREPARE POLYMERS WHICH ARE USED AS FIBERS, FILMS, FOAMS AND ADHESIVES.
Inventors
- 👤 J Habermeier
- 👤 D Porret
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:33
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/70; C08G18/72; C08G18/80; C08G18/8003; C08G18/8054; C08G18/8058; C07; C07D; C07D233/00; C07D233/54; C07D233/66; C07D233/72; C07D233/80; C08G18/77; C08G18/78; C08G18/7875; C08G18/7887
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) | 1976-11-26 | 1977-05-28 | 1977-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-26 | 1981-05-28 | 1981-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-26 | 1985-05-28 | 1985-11-27 | $7700.00 | Window Closed / Lapsed |