US3226368A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of preparing polyesterurethanes containing carbodiimide groups
Assignee: Bayer AG
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Filing: 1962-02-23
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Granted: 1965-12-28
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Expires: 1982-02-23
Abstract
No abstract record available.
Inventors
- 👤 Reischl Artur
- 👤 Holtschmidt Hans
- 👤 Fischer Peter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:23
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/09; C08G18/095; C08G18/16; C08G18/166; C08G18/168; C08G18/28; C08G18/40; C08G18/42; C08G2110/00; C08G2110/0008; C08G2110/0041; C08G2110/0058; C08G2110/0083; Y; Y10; Y10S; Y10S521/00; Y10S521/901
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
53 words
A METHOD FOR PREPARING POLYESTERURETHANES WHICH COMPRISES REACTING IN THE PRESENCE OF A PHOSPHOROUS CONTAINING CATALYST WHICH PROMOTES THE FORMATION OF CARBOIIMIDE GROUPS BY REACTION OF NCO GROUPS AN EXCESS OF AN ORGANIC POLYISOCYANATE WITH AN HYDROXYL TERMINATED POLYESTER PREPARED BY THE PROCESS WHICH COMPRISES REACTING A POLYHYDRIC ALCOHOL WITH A POLYCARBOXYLIC ACID.
Claim 2
Independent Claim
53 words
A METHOD FOR PREPARING POLYESTERURETHANES WHICH COMPRISES REACTING IN THE PRESENCE OF A PHOSPHOROUS CONTAINING CATALYST WHICH PROMOTES THE FORMATION OF CARBOIIMIDE GROUPS BY REACTION OF NCO GROUPS AN EXCESS OF AN ORGANIC POLYISOCYANATE WITH AN HYDROXYL TERMINATED POLYESTER PREPARED BY THE PROCESS WHICH COMPRISES REACTING A POLYHYDRIC ALCOHOL WITH A POLYCARBOXYLIC ACID.
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) | 1968-12-27 | 1969-06-28 | 1969-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-12-27 | 1973-06-28 | 1973-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-12-27 | 1977-06-28 | 1977-12-28 | $7700.00 | Window Closed / Lapsed |