Patent US3769265A successfully refreshed from Google Patents.
US3769265A
Expired / Lapsed
US
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Polyurethanes based on tertiary alcohol-modified naphthylene - 1,5 - diisocyanate
Assignee: Bayer AG
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Filing: 1972-02-14
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Granted: 1973-10-30
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Expires: 1992-02-14
Abstract
Abstract A PROCESS IS PROVIDED FOR THE PRODUCTION OF POLYURETHANE ELASTOMERS BY REACTING NAPHTHYLENE-1,5-DIISOCYANATE WITH A DIHYDROXY COMPOUND WHICH HAS A MOLECULAR WEIGHT OF 500 TO 6,000 TO PRODUCE A PREPOLYMER WHICH CONTAINS ISOCYANATE GROUPS AND REACTING THE PREPOLYMER WITH GLYCOLS, CHARACTERIZED IN THAT A MODIFIED NAPHTHYLENE1,5-DIISOCYANATE WHICH CONTAINS 0.02 TO 0.5 MOL, PREFERABLY 0.1 TO 0.25 MOL, OF UREA GROUPS OR BIURET GROUPS PER MOL OF NAPTHYLENE-1,5-DIISOCYANATE IS USED.
Inventors
- 👤 G Groegler
- 👤 W Kallert
- 👤 E Meisert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:49
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/70; C08G18/72; C08G18/77; C08G18/78; C08G18/7806; C08G18/7818; C08G18/7831; C08G18/08; C08G18/10; C08G18/74; C08G18/76; C08G18/7657; C08G18/7678; Y; Y10; Y10S; Y10S528/00; Y10S528/906
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) | 1976-10-29 | 1977-04-30 | 1977-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-29 | 1981-04-30 | 1981-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-29 | 1985-04-30 | 1985-10-30 | $7700.00 | Window Closed / Lapsed |