Patent US3216973A successfully refreshed from Google Patents.
US3216973A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyurethane plastics made with a triol bearing strictly secondary hydroxyl groups
Assignee: Bayer Corp
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Filing: 1961-11-16
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Granted: 1965-11-09
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Expires: 1981-11-16
Abstract
No abstract record available.
Inventors
- 👤 J W Britain
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 20:54
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/10; C08G18/28; C08G18/30; C08G18/38; C08G18/3855; C08G18/3863; C08G18/3865; C08G18/3868; C08G18/65; C08G18/6505; C08G18/67; C08G18/675; Y; Y10; Y10S; Y10S528/00; Y10S528/906
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
88 words
A METHOD OF MAKING A HEAT CURABLE POLYURETHANE PLASTIC COMPOSITION WHICH COMPRISES MIXING A POLYMERIC GLYCOL HAVING A MOLECULAR WEIGHT OF AT LEAST 600 WITH AN ORGANIC DIISOCYANATE AND A MIXTURE OF A DIFUNCTIONAL ORGANIC COMPOUND CONTAINING ACTIVE HYDROGEN ATOMS WHICH ARE REACTIVE WITH -NCO GROUPS, SAID COMPOUND HAVING A MOLECULAR WEIGHT OF LESS THAN 300 AND FROM ABOUT 0.0005 TO ABOUT 0.025 MOL OF A TRIHYDRIC ALCOHOL HAVING SECONDARY HYDROXYL GROUPS AS ITS SOLE GROUPS REACTIVE WITH -NCO GROUPS PER 100 PARTS OF THE SAID POLYMERIC GLYCOL.
Claim 2
Independent Claim
88 words
A METHOD OF MAKING A HEAT CURABLE POLYURETHANE PLASTIC COMPOSITION WHICH COMPRISES MIXING A POLYMERIC GLYCOL HAVING A MOLECULAR WEIGHT OF AT LEAST 600 WITH AN ORGANIC DIISOCYANATE AND A MIXTURE OF A DIFUNCTIONAL ORGANIC COMPOUND CONTAINING ACTIVE HYDROGEN ATOMS WHICH ARE REACTIVE WITH -NCO GROUPS, SAID COMPOUND HAVING A MOLECULAR WEIGHT OF LESS THAN 300 AND FROM ABOUT 0.0005 TO ABOUT 0.025 MOL OF A TRIHYDRIC ALCOHOL HAVING SECONDARY HYDROXYL GROUPS AS ITS SOLE GROUPS REACTIVE WITH -NCO GROUPS PER 100 PARTS OF THE SAID POLYMERIC GLYCOL.
References Cited (Backward Citations)
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Cited
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Cited
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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) | 1968-11-08 | 1969-05-10 | 1969-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-08 | 1973-05-10 | 1973-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-08 | 1977-05-10 | 1977-11-09 | $7700.00 | Window Closed / Lapsed |