Patent US3556785A successfully refreshed from Google Patents.
US3556785A
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Sensitizers for organic photoconductor comprising orazolone and butenolide derivatives of of fluorenone
Assignee: AB Dick Co
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Filing: 1968-02-23
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Granted: 1971-01-19
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Expires: 1988-02-23
Abstract
Abstract THE COMPOUNDS ARE OF THE CLASS OF OXAZOLONE DERIVATIVES AND BUTENOLIDE DERIVATIVES OF FLUORENONE USEFUL AS SENSITIZERS FOR ORGANIC PHOTOCONDUCTIVE MEDIA. AN EXAMPLE OF A PARTICULAR SPECIES IS 2-PHENYL-4(2,4,7-TRINITRO-9-FLUORENYLIDENE)-5-OXAZOLONE.
Inventors
- 👤 Evans S Baltazzi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:58
CPC Classifications
C; C07; C07D; C07D307/00; C07D307/02; C07D307/26; C07D307/30; C07D307/32; C07D307/33; C07D263/00; C07D263/02; C07D263/30; C07D263/34; C07D263/36; C07D263/38; G; G03; G03G; G03G5/00; G03G5/02; G03G5/04; G03G5/06; G03G5/0601; G03G5/0605; G03G5/0607; G03G5/0622; G03G5/0624; G03G5/0627; G03G5/0629; G03G5/0631
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) | 1974-01-18 | 1974-07-20 | 1975-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-18 | 1978-07-20 | 1979-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-18 | 1982-07-20 | 1983-01-19 | $7700.00 | Window Closed / Lapsed |