Patent US3243475A successfully refreshed from Google Patents.
US3243475A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyurethanes
Assignee: Bayer AG
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Filing: 1961-05-24
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Granted: 1966-03-29
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Expires: 1981-05-24
Abstract
No abstract record available.
Inventors
- 👤 Reischl Arthur
- 👤 Simmler Walter
- 👤 Muller Erwin
- 👤 Ellegast Konrad
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:02
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/61; C08G18/30; C08G18/38; C08G18/3893; C08G77/00; C08G77/48; C08G2110/00; C08G2110/0041; C08G2110/005; C08G2110/0083; Y; Y10; Y10S; Y10S521/00; Y10S521/905
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
69 words
A METHOD FOR MAKING A POLYURETHANE PLASTIC WHICH COMPRISES REACTING A POLYESTER PREPARED BY ESTERIFICATION OF A POLYCARBOXYLIC ACID AND A POLYHYDRIC ALCOHOL, SAID POLYESTER HAVING A MOLECULAR WEIGHT OF AT LEAST ABOUT 500, AN HYDROXYL NUMBER OF NOT MORE THAN ABOUT 225 AND AN ACID NUMBER NOT SUBSTANTIALLY MORE THAN ABOUT 10, WITH AN ORGANIC POLYISOCYANATE IN A REACTION MIXTURE CONTAINING A SILICON COMPOUND HAVING THE GENERAL FORMULA
Claim 2
Independent Claim
69 words
A METHOD FOR MAKING A POLYURETHANE PLASTIC WHICH COMPRISES REACTING A POLYESTER PREPARED BY ESTERIFICATION OF A POLYCARBOXYLIC ACID AND A POLYHYDRIC ALCOHOL, SAID POLYESTER HAVING A MOLECULAR WEIGHT OF AT LEAST ABOUT 500, AN HYDROXYL NUMBER OF NOT MORE THAN ABOUT 225 AND AN ACID NUMBER NOT SUBSTANTIALLY MORE THAN ABOUT 10, WITH AN ORGANIC POLYISOCYANATE IN A REACTION MIXTURE CONTAINING A SILICON COMPOUND HAVING THE GENERAL FORMULA
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) | 1969-03-28 | 1969-09-27 | 1970-03-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-03-28 | 1973-09-27 | 1974-03-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-03-28 | 1977-09-27 | 1978-03-29 | $7700.00 | Window Closed / Lapsed |