Patent US3789033A successfully refreshed from Google Patents.
US3789033A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyurethanes based on aryloxy-carbonyl isocyanates
Assignee: Bayer AG
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Filing: 1971-09-22
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Granted: 1974-01-29
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Expires: 1991-09-22
Abstract
Abstract MASKED OXYCARBONYLIXOCANATES ARE PREPARED BY REACTING ARYL OXYCARBONYLISOCYANATES WITH A COMPOUND CONTAINING AT LEAST TWO HYDROXYL GROUPS. WHEN NCO AND OH ARE PRESENT IN EQUIVALENT AMOUNTS, THE COMPOUNDS ARE SUITABLE AS REACTANTS WITH POLYMERS CONTAINING HYDROXYL GROUPS OF THE PRODUCTION OF, FOR EXAMPLE, LACQUERS. WHEN THE REACTION IS CARRIED OUT SUCH THAT OH GROUPS ARE PRESENT IN EXCESS OF THAT REQUIRED TO REACT WITH THE AVAILABLE -NCO, THE COMPOUNDS, WHICH ARE SELF CROSS-LINKING, ARE SUITABLE FOR THE PRODUCTION OF, FOR EXAMPLE, CROSS-LINKED SYNTHETIC RESINS.
Inventors
- 👤 W Zankl
- 👤 De Ramis A Zankl
- 👤 E Zankl
- 👤 H Zankl
- 👤 H Hagemann
- 👤 J Pedain
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 09:22
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/70; C08G18/701; C08G18/71; C08G18/711; C08K; C08K5/00; C08K5/16; C08K5/29; Y; Y10; Y10S; Y10S524/00; Y10S524/904; Y10S528/00; Y10S528/902
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) | 1977-01-28 | 1977-07-30 | 1978-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-28 | 1981-07-30 | 1982-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-28 | 1985-07-30 | 1986-01-29 | $7700.00 | Window Closed / Lapsed |