US4091208A
Expired / Lapsed
US
⏱️ 0.0 years remaining
α-(9-Anthryl)-β-(3-carbazolyl)ethylene derivatives
Assignee: Ricoh Co Ltd
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Filing: 1977-04-07
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Granted: 1978-05-23
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Expires: 1997-04-07
Abstract
Abstract α-(9-Anthryl)-β-(3-carbazolyl)ethylene derivatives, process for preparing same and electrophotographic light-sensitive materials containing α-(9-anthryl)-β-(3-carbazolyl)ethylene derivative.
Inventors
- 👤 Mitsuo Okazaki
- 👤 Akihiro Yamaguchi
- 👤 Masaomi Sasaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 01:51
CPC Classifications
C; C07; C07D; C07D209/00; C07D209/56; C07D209/80; C07D209/82; C07D209/86; C07F; C07F9/00; C07F9/02; C07F9/28; C07F9/38; C07F9/40; C07F9/4003; C07F9/4021; G; G03; G03G; G03G5/00; G03G5/02; G03G5/04; G03G5/06; G03G5/0601; G03G5/0605; G03G5/0622; G03G5/0624; G03G5/0627; G03G5/0629; G03G5/0664; G03G5/0666; G03G5/0668; G03G5/067
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
21 words
α-(9-anthryl)-β-(3-carbazolyl)ethylene derivative having the formula (I): ##STR6## wherein R is a lower alkyl group of from 1 to 4 carbon atoms.
Claim 2
Dependent Claim
21 words
α-(9-anthryl)-β-(3-carbazolyl)ethylene derivative having the formula (I): ##STR6## wherein R is a lower alkyl group of from 1 to 4 carbon atoms.
Claim 3
Dependent Claim
14 words
α-(9-anthryl)-β-(3-carbozolyl)ethylene derivative according to claim 1 wherein said derivative has the formula (II): ##STR7##
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-05-22 | 1981-11-21 | 1982-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-05-22 | 1985-11-21 | 1986-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-05-22 | 1989-11-21 | 1990-05-23 | $7700.00 | Window Closed / Lapsed |