US3732186A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyisocyanates containing cyclic imide groups
Assignee: Bayer AG
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Filing: 1971-08-05
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Granted: 1973-05-08
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Expires: 1991-08-05
Abstract
Abstract A POLYISOCYANATE COMPOSITION CONTAINING AT LEAST TWO FREE -NCO GROUPS AND AT LEAST ONE CYCLIC IMIDE GROUP IN THE MOLECULE AND HAVING A MOLECULAR WEIGHT OF FROM ABOUT 200 TO ABOUT 10,000 ARE PREPARED BY REACTING, IN AN INERT ORGANIC SOLVENT, ALIPHATIC AND AROMATIC ANHYDRIDES WITH ORGANIC POLYISOCYANATES. THE POLYISOCYANATE OF THE INVENTION ARE PARTICULARLY USEFUL AS PRECURSORS IN THE PREPARATION OF LACQUERS AND COATINGS.
Inventors
- 👤 W Dunwald
- 👤 K Mielke
- 👤 G Muller
- 👤 R Merten
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:47
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/58; C08G18/30; C08G18/34; C08G18/70; C08G18/72; C08G18/80; C08G18/8003; C08G18/8048; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31551; Y10T428/31605; Y10T428/31678
Claims Analysis
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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) | 1976-05-07 | 1976-11-06 | 1977-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-07 | 1980-11-06 | 1981-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-07 | 1984-11-06 | 1985-05-08 | $7700.00 | Window Closed / Lapsed |