US3748303A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Halogenated biphenol polyesters and polycarbonates
Assignee: General Electric Co
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Filing: 1972-01-28
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Granted: 1973-07-24
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Expires: 1992-01-28
Abstract
Abstract HALOBIPHENOLS CAN BE PRODUCED FROM PRECURSOR DIPHENOQUINONES BY EFFECTING REACTION BETWEEN THE DIPHENOQUINONE AND A HYDROGEN HALIDE, SUCH AS HYDROGEN CHLORIDE, WHILE THE DIPHENOQUINONE IS SUSPENDED IN A LIQUID MEDIUM OF THE CLASS OF WATER, LOWER ALKANOLS AND MIXTURES OF WATER AND SAID ALKANOLS. THE BIPHENOLS THUS OBTAINED CAN BE USED AS ANTIOXIDANTS OR AS INTERMEDIATES IN THE PREPARATION OF OTHER DIPHENOQUINONES AND POLYMERIC COMPOSITIONS USEFUL IN THE COATING AND INSULATING ARTS.
Inventors
- 👤 H Becker
- 👤 A Gilbert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:50
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/68; C08G63/682; C08G63/6824; C08G63/6826; C08G64/00; C08G64/04; C08G64/06; C08G64/08; C08G64/10
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) | 1976-07-23 | 1977-01-22 | 1977-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-23 | 1981-01-22 | 1981-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-23 | 1985-01-22 | 1985-07-24 | $7700.00 | Window Closed / Lapsed |