Patent US3236790A successfully refreshed from Google Patents.
US3236790A
Expired / Lapsed
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Polyurethanes from a rosin acid polyether-ester
Assignee: Bayer Corp
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Filing: 1962-11-28
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Granted: 1966-02-22
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Expires: 1982-11-28
Abstract
No abstract record available.
Inventors
- 👤 John F Szabat
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 23:50
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/48; C08G18/4891
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
88 words
A POLYURETHANE PLASTIC OBTAINED BY A PROCESS WHICH COMPRISES REACTING AN ORGANIC POLYISOCYANATE WITH AN HYDROXYL POLYETHER-ESTER HAVING A MOLECULAR WEIGHT OF FROM ABOUT 614 TO ABOUT 2200 PREPARED BY A PROCESS WHICH COMPRISES REACTION FROM ABOUT 1 TO ABOUT 32 MOLS OF AN ALKYLENE OXIDE WITH THE ESTERIFICATION PRODUCT OF ROSIN ACID WITH A POLYHYDRIC ALCOHOL HAVING 3 TO 8 FREE HYDROXYL GROUPS, SAID ROSIN ACID AND SAID POLYHYDRIC ALCOHOL BEING REACTED IN SUCH RELATIVE PROPORTIONS THAT SAID ESTERIFICATION PRODUCT HAS AT LEAST TWO FREE HYDROXYL GROUPS.
Claim 2
Dependent Claim
88 words
A POLYURETHANE PLASTIC OBTAINED BY A PROCESS WHICH COMPRISES REACTING AN ORGANIC POLYISOCYANATE WITH AN HYDROXYL POLYETHER-ESTER HAVING A MOLECULAR WEIGHT OF FROM ABOUT 614 TO ABOUT 2200 PREPARED BY A PROCESS WHICH COMPRISES REACTION FROM ABOUT 1 TO ABOUT 32 MOLS OF AN ALKYLENE OXIDE WITH THE ESTERIFICATION PRODUCT OF ROSIN ACID WITH A POLYHYDRIC ALCOHOL HAVING 3 TO 8 FREE HYDROXYL GROUPS, SAID ROSIN ACID AND SAID POLYHYDRIC ALCOHOL BEING REACTED IN SUCH RELATIVE PROPORTIONS THAT SAID ESTERIFICATION PRODUCT HAS AT LEAST TWO FREE HYDROXYL GROUPS.
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) | 1969-02-21 | 1969-08-23 | 1970-02-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-02-21 | 1973-08-23 | 1974-02-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-02-21 | 1977-08-23 | 1978-02-22 | $7700.00 | Window Closed / Lapsed |