Patent US3012991A successfully refreshed from Google Patents.
US3012991A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chemical reactions
Assignee: Bayer AG
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Filing: 1957-11-13
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Granted: 1961-12-12
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Expires: 1977-11-13
Abstract
No abstract record available.
Inventors
- 👤 Schultheis Heinz
- 👤 Kallert Wilhelm
- 👤 Delfs Detlef
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 05:56
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/16; C08G18/166; C08G18/168; Y; Y10; Y10S; Y10S273/00; Y10S273/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
71 words
A METHOD FOR MAKING A URETHANE WHICH COMPRISES REACTING AN ORGANIC ISOCYANATE WITH AN ORGANIC COMPOUND HAVING AT LEAST ONE REACTIVE HYDROGEN ATOM DETERMINABLE BY THE ZEREWITINOFF METHOD WHILE IN ADMIXTURE WITH A CATALYTIC AMOUNT OF A GAMMA-PYRONE HAVING AS A SUBSTITUENT AT LEAST ONE MEMBER SELECTED FROM THE GROUP CONSISTING OF LOWER ALKYL RADICALS, ARYL RADICALS, ARALKYL RADICALS, HETERO CYCLIC RADICALS CONTAINING OXYGEN, CARBOXYL GROUPS AND CARBOXYLIC ACID ESTER GROUPS.
Claim 2
Independent Claim
71 words
A METHOD FOR MAKING A URETHANE WHICH COMPRISES REACTING AN ORGANIC ISOCYANATE WITH AN ORGANIC COMPOUND HAVING AT LEAST ONE REACTIVE HYDROGEN ATOM DETERMINABLE BY THE ZEREWITINOFF METHOD WHILE IN ADMIXTURE WITH A CATALYTIC AMOUNT OF A GAMMA-PYRONE HAVING AS A SUBSTITUENT AT LEAST ONE MEMBER SELECTED FROM THE GROUP CONSISTING OF LOWER ALKYL RADICALS, ARYL RADICALS, ARALKYL RADICALS, HETERO CYCLIC RADICALS CONTAINING OXYGEN, CARBOXYL GROUPS AND CARBOXYLIC ACID ESTER GROUPS.
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) | 1964-12-11 | 1965-06-12 | 1965-12-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-12-11 | 1969-06-12 | 1969-12-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-12-11 | 1973-06-12 | 1973-12-12 | $7700.00 | Window Closed / Lapsed |