US3799953A
Expired / Lapsed
US
⏱️ 0.0 years remaining
1,4-bis(4,'4''-dihydroxy-triphenylmethyl)benzene
Assignee: Bayer AG
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Filing: 1972-09-01
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Granted: 1974-03-26
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Expires: 1992-09-01
Abstract
Abstract THE SUBJECT MATTER OF THE INVENTION RELATES TO 1,4-BISBIS-(4'',4"-DIHYDROXY-TRI-PHENYL-METHYL)-BENZENE AND PLASTIES, IN PARTICULAR TO BRANCHED POLYCARBONATES, ON THE BASIS OF THIS TETRA-HYDROXY-COMPOUND.
Inventors
- 👤 D Freitag
- 👤 U Haberland
- 👤 H Krimm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 08:31
CPC Classifications
C; C07; C07C; C07C39/00; C07C39/12; C07C39/15; C08; C08G; C08G64/00; C08G64/04; C08G64/06; C08G64/14
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) | 1977-03-25 | 1977-09-24 | 1978-03-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-25 | 1981-09-24 | 1982-03-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-25 | 1985-09-24 | 1986-03-26 | $7700.00 | Window Closed / Lapsed |