Patent US2399442A successfully refreshed from Google Patents.
Patent US2879248A successfully refreshed from Google Patents.
US2879248A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making copolymer of diisocyanate modified polyester and vinylidene monomer
Assignee: Bayer AG
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Filing: 1955-04-13
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Granted: 1959-03-24
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Expires: 1975-04-13
Abstract
No abstract record available.
Inventors
- 👤 Nischk Gunther
- 👤 Karl E Muller
- 👤 Goerden Leonhard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:13
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/67; C08G18/68; C08F; C08F18/00; C08F18/02; C08F18/04; C08F18/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
132 words
METHOD FOR MAKING NONPOROUS POLYMERS WHICH COMPRISES REACTING AN HYDROXYL TERMINATED POLYESTER OBTAINED BY THE ESTERIFICATION OF DICARBOXYLIC ACID CONTAINING FROM ABOUT 5 PERCENT TO ABOUT 100 PERCENT ETHYLENICALLY UNSATURATED DICARBOXYLIC ACIDS AND A DIHYDRIC ALCOHOL, SAID POLYESTER HAVING AN HYDROXYL NUMBER OF FROM ABOUT 30 TO ABOUT 400 AND AN ACID NUMBER OF FROM 0 TO 50 WITH AN ORGANIC DIISOCYANATE, SAID ORGANIC DIISOCYNATE BEING IN AN AMOUNT OF ABOUT 40 PERCENT TO ABOUT 80 PERCENT OF THE THEORETICAL AMOUNT REQUIRED TO REACT WITH AL THE HYDROXYL GROUPS OF SAID POLYESTER, AND THEREAFTER HEATING THE RESULTING ADDITION PRODUCT HAVING UNREACTED HYDROXYL GROUPS WITH FROM ABOUT 10 PERCENT TO ABOUT 100 PERCENT, BASED ON THE WEIGHT OF SAID ADDITION PRODUCT, OF A MONOMERIC COMPOUND CONTAINING AT LEAST ONE RADICAL HAVING THE FORMULA
Claim 2
Dependent Claim
132 words
METHOD FOR MAKING NONPOROUS POLYMERS WHICH COMPRISES REACTING AN HYDROXYL TERMINATED POLYESTER OBTAINED BY THE ESTERIFICATION OF DICARBOXYLIC ACID CONTAINING FROM ABOUT 5 PERCENT TO ABOUT 100 PERCENT ETHYLENICALLY UNSATURATED DICARBOXYLIC ACIDS AND A DIHYDRIC ALCOHOL, SAID POLYESTER HAVING AN HYDROXYL NUMBER OF FROM ABOUT 30 TO ABOUT 400 AND AN ACID NUMBER OF FROM 0 TO 50 WITH AN ORGANIC DIISOCYANATE, SAID ORGANIC DIISOCYNATE BEING IN AN AMOUNT OF ABOUT 40 PERCENT TO ABOUT 80 PERCENT OF THE THEORETICAL AMOUNT REQUIRED TO REACT WITH AL THE HYDROXYL GROUPS OF SAID POLYESTER, AND THEREAFTER HEATING THE RESULTING ADDITION PRODUCT HAVING UNREACTED HYDROXYL GROUPS WITH FROM ABOUT 10 PERCENT TO ABOUT 100 PERCENT, BASED ON THE WEIGHT OF SAID ADDITION PRODUCT, OF A MONOMERIC COMPOUND CONTAINING AT LEAST ONE RADICAL HAVING THE 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) | 1962-03-23 | 1962-09-22 | 1963-03-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-03-23 | 1966-09-22 | 1967-03-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-03-23 | 1970-09-22 | 1971-03-24 | $7700.00 | Window Closed / Lapsed |