Patent US3240903A successfully refreshed from Google Patents.
Patent US3202636A successfully refreshed from Google Patents.
US3202636A
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Isocyanato terminated urethane cured with a carboxylic acid hydrazide
Assignee: Bayer AG
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Filing: 1961-02-20
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Granted: 1965-08-24
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Expires: 1981-02-20
Abstract
No abstract record available.
Inventors
- 👤 Windemuth Erwin
- 👤 Kassack Fritz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:11
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/10; Y; Y10; Y10S; Y10S528/00; Y10S528/905; Y10S528/906
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
64 words
A PROCESS FOR PREPAIRNG POLYURETHANE PLASTICS WHICH COMPRISES REACTING A CARBOXYLIC ACID HYDRAZIDE WITH AN EXCESS OF AN ORGANIC POLYISOCYANATE, SAID ORGANIC POLYISOCYANATE HAVING A MOLECULAR WEIGHT OF AT LEAST 400 AND PRPEPARED BY THE PROCESS WHICH COMPRISES REACTING A MONOMERIC ORGANIC POLYISOCYANATE WITH AN ORGANIC COMPOUND CONTAINING ACTIVE HYDROGEN CONTAINING GROUPS AS DETERMINED BY THE ZEREWITINOFF METHOD WHICH ARE REACTIVE WITH ISOCYANATE GROUPS,
Claim 2
Dependent Claim
64 words
A PROCESS FOR PREPAIRNG POLYURETHANE PLASTICS WHICH COMPRISES REACTING A CARBOXYLIC ACID HYDRAZIDE WITH AN EXCESS OF AN ORGANIC POLYISOCYANATE, SAID ORGANIC POLYISOCYANATE HAVING A MOLECULAR WEIGHT OF AT LEAST 400 AND PRPEPARED BY THE PROCESS WHICH COMPRISES REACTING A MONOMERIC ORGANIC POLYISOCYANATE WITH AN ORGANIC COMPOUND CONTAINING ACTIVE HYDROGEN CONTAINING GROUPS AS DETERMINED BY THE ZEREWITINOFF METHOD WHICH ARE REACTIVE WITH ISOCYANATE GROUPS,
References Cited (Backward Citations)
US2956986A
Cited
US3004945A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-08-23 | 1969-02-22 | 1969-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-08-23 | 1973-02-22 | 1973-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-08-23 | 1977-02-22 | 1977-08-24 | $7700.00 | Window Closed / Lapsed |