US3637590A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermoplastic polyether resins of bisphenols
Assignee: ALTON J LANDUA
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Filing: 1970-03-31
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Granted: 1972-01-25
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Expires: 1990-03-31
Abstract
Abstract WHEREIN X IS THE CENTRAL OR RESIDUE GROUP, BETWEEN THE -OH GROUPS, OF A DIHYDRIC POLYNUCLEAR PHENOL AND Y THE CENTRAL OR RESIDUE GROUP, BETWEEN THE OXIRANE RINGS, OF A TERMINAL DI-VIC-EPOXIDE. PREFERRED ARE THOSE POLYETHERS IN WHICH X AND Y ARE THE RESIDUE GROUPS, RESPECTIVELY, OF BISPHENOLS AND OF DIGLYCIDYL ETHERS OR LOWER POLYETHERS OF BISPHENOLS, ESPECIALLY PREFERRED BISPHENOLS BEING BISPHENOL A AND 4,4''-DIHYDROXYDIPHENYLMETHYLPHENYLMETHANE. -(O-X-O-CH2-CH(-OH)-Y-CH(-OH)-CH2)- NOVEL THERMOPLASTIC POLYETHERS HAVING HIGH IMPACT RESISTANCE CONSIST ESSENTIALLY OF LINEAR MOLECULES HAVING A REPEATING STRUCTURE
Inventors
- 👤 Russel L Maycock
- 👤 Alton J Landua
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:55
CPC Classifications
C; C08; C08G; C08G59/00; C08G59/18; C08G59/40; C08G59/62; C08G59/621; C08G59/20; C08G59/22
Claims Analysis
Total Claims: 0
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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) | 1975-01-24 | 1975-07-26 | 1976-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-24 | 1979-07-26 | 1980-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-24 | 1983-07-26 | 1984-01-25 | $7700.00 | Window Closed / Lapsed |