Patent US3825642A successfully refreshed from Google Patents.
Patent US3239480A successfully refreshed from Google Patents.
US3239480A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyurethanes synthesized with the aid of carboxylic acid salts
Assignee: Bayer AG
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Filing: 1963-01-28
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Granted: 1966-03-08
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Expires: 1983-01-28
Abstract
No abstract record available.
Inventors
- 👤 Windemuth Erwin
- 👤 Moller Friedrich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 12:23
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/16; C08G18/18; C08G18/1875; C08G18/22; C08G18/225; C08G18/28; C08G18/40; C08G18/64; C08G18/6484; C08G18/70
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
74 words
A METHOD CATALYZING THE REACTION BETWEEN AN ORGANIC POLYISOCYANATE AND AN ORGANIC COMPOUND CONTAINING ACTIVE HYDROGEN CONTAINING GROUPS AS DETERMINED BY THE ZEREWITINOFF METHOD WHICH COMPRISES REACTING SAID COMPONENTS WHILE MIXED WITH A SALT OF A CARBOXYLIC ACID, HAVING A DIUSSOCIATION CONSTANT GREATER THAN ABOUT 1X10**-3 WHICH DECOMPOSE BY DECARBOXYLATION TO CARBON DIOXIDE AND AN ORGANIC COMPOUND, AND A MEMBER SELECTED FROM THE GROUP CONSISTING OF TERTIARY AMINES, ALKALI METALS AND QUATERNARY AMMONIUM IONS.
Claim 2
Independent Claim
74 words
A METHOD CATALYZING THE REACTION BETWEEN AN ORGANIC POLYISOCYANATE AND AN ORGANIC COMPOUND CONTAINING ACTIVE HYDROGEN CONTAINING GROUPS AS DETERMINED BY THE ZEREWITINOFF METHOD WHICH COMPRISES REACTING SAID COMPONENTS WHILE MIXED WITH A SALT OF A CARBOXYLIC ACID, HAVING A DIUSSOCIATION CONSTANT GREATER THAN ABOUT 1X10**-3 WHICH DECOMPOSE BY DECARBOXYLATION TO CARBON DIOXIDE AND AN ORGANIC COMPOUND, AND A MEMBER SELECTED FROM THE GROUP CONSISTING OF TERTIARY AMINES, ALKALI METALS AND QUATERNARY AMMONIUM IONS.
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) | 1969-03-07 | 1969-09-06 | 1970-03-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-03-07 | 1973-09-06 | 1974-03-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-03-07 | 1977-09-06 | 1978-03-08 | $7700.00 | Window Closed / Lapsed |