US3579591A
Expired / Lapsed
US
⏱️ 0.0 years remaining
4,4'-bis-(hydroxyarloxy)-phenylsulfone
Assignee: Bayer AG
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Filing: 1968-10-08
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Granted: 1971-05-18
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Expires: 1988-10-08
Abstract
Abstract ARYL ETHERS OF THE FORMULA 1-(HO-R-O-(1,4-PHENYLENE)-SO2-),4-(HO-R-)-BENZENE WHEREIN R IS A BIVALENT AROMATIC RADICAL AND THE UNTILITY THEREOF AS INTERMEDIATES FOR REACTION WITH CARBOXYLIC ACID HALIDES, DICARBOXYLIC ACID DIHALIDES, ISOCYANATES AND POLYISOCYANATES TO PRODUCE, RESPECTIVELY, DIESTERS, POLYESTERS, DIURETHANES AND POLYURETHANES. THE AFORESAID EITHERS ARE PREPARED BY REACTING 1 MOL OF 4,4''-DIHALO-DIPHENYLSUPHONE WITH ABOUT 2 MOLS DIPHENOLATE AT A TEMPERATURE BETWEEN ABOUT 100 AND 160*C. AND ACIDIFYING RESULTING PRODUCT.
Inventors
- 👤 Hermann Schnell
- 👤 Gerhard Darsow
- 👤 Ludwig Bottenbruch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 02:33
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/28; C07; C07C; C07C317/00; C07C317/16; C07C317/22; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/10; C08G18/28; C08G18/30; C08G18/38; C08G18/3855; C08G18/3863; C08G18/3865; C08G18/3872; C08G63/00; C08G63/68; C08G63/688; C08G63/6884; C08G63/6886; C08J2375/00; C08J2375/04
Claims Analysis
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References Cited (Backward Citations)
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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) | 1974-05-17 | 1974-11-16 | 1975-05-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-17 | 1978-11-16 | 1979-05-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-17 | 1982-11-16 | 1983-05-18 | $7700.00 | Window Closed / Lapsed |