US3577444A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Substituted anthraquinones
Assignee: International Business Machines Corp
•
Filing: 1969-01-08
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Granted: 1971-05-04
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Expires: 1989-01-08
Abstract
Abstract ANTHRAQUINONES HAVING AT THE 2 AND THE 6 POSITIONS SUBSTITUENTS SELECTED FROM THE GROUP CONSISTING OF R-N(-R)-(1,4-PHENYLENE)-CH=N- AND R-N(-R)-(1,4-PHENYLENE-CH=CH=N- WHEREIN R IS LOWER ALKYL. THE COMPOUNDS ARE USEFUL AS DICHROIC PHOTOCONDUCTORS AND AS PHOTOSENSITIZERS FOR PHOTOCONDUCTIVE POLYMERS SUCH AS POLYVINYLCARBAZOLE.
Inventors
- 👤 Nicholas J Clecak
- 👤 Robert J Cox
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:04
CPC Classifications
C; C09; C09B; C09B1/00; C09B1/16; C09B1/20; C09B1/205; C09B23/00; C09B23/16; C09B23/162; C09B23/164; C09B55/00; C09B55/005; C09B55/007; G; G03; G03G; G03G5/00; G03G5/02; G03G5/04; G03G5/06; G03G5/0664
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) | 1974-05-03 | 1974-11-02 | 1975-05-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-03 | 1978-11-02 | 1979-05-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-03 | 1982-11-02 | 1983-05-04 | $7700.00 | Window Closed / Lapsed |