US3723389A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermoplastic aromatic poly(ether-sulfones)
Assignee: Honeywell International Inc
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Filing: 1971-10-27
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Granted: 1973-03-27
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Expires: 1991-10-27
Abstract
Abstract POLYMERIC CONDENSATION PRODUCTS OF ABOUT EQUIMOLAR AMOUNTS OF P,P''-DIHALODIPHENYL SULFONE WITH ALKALI METAL BISPHENATES OF THE FORMULA 1-((4-(ME-O-)PHENYL)-C(-A)(-B)-),4-(ME-O-)BENZENE WHEREIN ME IS AN ALKALI METAL. A AND B ARE HYDROGEN, ALKYL, PHENYL OR ALKALI METAL CARBOXYLATE SUBSTITUTED ALKYL, AT LEAST ONE OF A AND B BEING ALKALI METAL CARBOXYLATE SUBSTITUTED ALKYL, OR MIXTURES OF THE ABOVE ALKALI METAL BISPHENATE WITH AN ALKALI METAL BISPHENATE OF THE SAME FORMULA WHEREIN ME IS AS STATED ABOVE AND A AND B ARE HYDROGEN, ALKYL OR PHENYL ARE RESISTANT TO ATTACK BY SOLVENTS AND TO ENVIRONMENT STRESS CRACKING.
Inventors
- 👤 G Khattab
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 07:04
CPC Classifications
C; C08; C08G; C08G75/00; C08G75/20; C08G75/23; C07; C07C; C07C59/00; C07C59/40; C07C59/42; C07C59/52; C08G2650/00; C08G2650/62; C08G2650/64
Claims Analysis
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-03-26 | 1976-09-25 | 1977-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-26 | 1980-09-25 | 1981-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-26 | 1984-09-25 | 1985-03-27 | $7700.00 | Window Closed / Lapsed |