US3201372A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Biuret polyisocyanate based polyurethanes
Assignee: Bayer AG
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Filing: 1963-12-05
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Granted: 1965-08-17
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Expires: 1983-12-05
Abstract
No abstract record available.
Inventors
- 👤 Wagner Kuno
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 04:46
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/70; C08G18/72; C08G18/77; C08G18/78; C08G18/7806; C08G18/7818; C08G18/7831; C07; C07C; C07C275/00; C07C275/46; C07C275/58; C07C275/62; C08G18/28; C08G18/30; C08G18/38; C08G18/3878; C08G18/40; C08G18/48; C08G18/50; C08G18/5075; C08G18/80; C08G18/8003; C08G18/8045; Y; Y10; Y10S; Y10S521/00; Y10S521/902; Y10S528/00; Y10S528/906
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
51 words
IN A PROCESS FOR THE PREPARATION OF A POLYURETHANE WHICH COMPRISES REACTING AN ORGANIC POLYISOCYANATE WITH AN ORGANIC COMPOUND HAVING AT LEAST TWO REACTIVE HYDROGEN CONTAINING GROUPS AS DETERMINED BY THE ZEREWITINOFF METHOD, THE IMPROVEMENT WHICH COMPRISES REACTING A BIURET POLYISOCYANATE WITH THE REACTIVE HYDROGEN CONTAINING COMPOUND TO FORM THE POLYURETHANE.
Claim 2
Dependent Claim
51 words
IN A PROCESS FOR THE PREPARATION OF A POLYURETHANE WHICH COMPRISES REACTING AN ORGANIC POLYISOCYANATE WITH AN ORGANIC COMPOUND HAVING AT LEAST TWO REACTIVE HYDROGEN CONTAINING GROUPS AS DETERMINED BY THE ZEREWITINOFF METHOD, THE IMPROVEMENT WHICH COMPRISES REACTING A BIURET POLYISOCYANATE WITH THE REACTIVE HYDROGEN CONTAINING COMPOUND TO FORM THE POLYURETHANE.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-08-16 | 1969-02-15 | 1969-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-08-16 | 1973-02-15 | 1973-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-08-16 | 1977-02-15 | 1977-08-17 | $7700.00 | Window Closed / Lapsed |