US4454212A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrophotographic photoconductor
Assignee: Ricoh Co Ltd
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Filing: 1982-09-15
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Granted: 1984-06-12
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Expires: 2002-09-15
Abstract
Abstract An electrophotographic photoconductor is prepared by forming a photoconductive layer containing a hydrazone compound therein on an electroconductive support member. The hydrazone compounds represented by the following general formula, are useful as photoconductive materials and as charge transport materials for use in electrophotography: ##STR1## wherein R 1 represents a methyl group, an ethyl group, a 2-hydroxyethyl group, or a 2-chloroethyl group, and R 2 represents a methyl group, an ethyl group, a benzyl group or a phenyl group.
Inventors
- 👤 Kiyoshi Sakai
- 👤 Mitsuru Hashimoto
- 👤 Masafumi Ohta
- 👤 Masaomi Sasaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:48
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/02; G03G5/04; G03G5/06; G03G5/0622; G03G5/0624; G03G5/0627; G03G5/0629
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
37 words
An electrophotographic element comprising: an electroconductive support member; a charge carrier producing layer; a charge transport layer adjacent said charge carrier producing layer, the charge transport layer consisting of 9-ethylcarbazole-3-carbaldehyde-1-methyl-phenylhydrazone having the formula ##STR47## and a binder.
Claim 2
Dependent Claim
37 words
An electrophotographic element comprising: an electroconductive support member; a charge carrier producing layer; a charge transport layer adjacent said charge carrier producing layer, the charge transport layer consisting of 9-ethylcarbazole-3-carbaldehyde-1-methyl-phenylhydrazone having the formula ##STR47## and a binder.
Claim 3
Dependent Claim
39 words
An electrophotographic element as claimed in claim 1, wherein said charge carrier producing layer is positioned between said electroconductive support member and said charge transport layer, with said charge transport layer forming an exposed surface of said electrophotographic element.
Claim 4
Dependent Claim
36 words
An electrophotographic element as claimed in claim 1, wherein said charge carrier producing layer has a thickness of less than 5 μm, and said charge transport layer has a thickness between 3 μm and 50 μm.
Claim 5
Dependent Claim
53 words
In an electrophotographic element comprising a photoconductive layer and an electroconductive support member for supporting said photoconductive layer thereon, the improvement wherein said photoconductive layer comprises: a charge transport medium consisting of a binder and 9-ethylcarbazole-3-carbaldehyde 1-methyl-1-phenylhydrazone having the formula ##STR48## and a charge carrier producing material dispersed in said charge transport medium.
Claim 6
Dependent Claim
53 words
In an electrophotographic element comprising a photoconductive layer and an electroconductive support member for supporting said photoconductive layer thereon, the improvement wherein said photoconductive layer comprises: a charge transport medium consisting of a binder and 9-ethylcarbazole-3-carbaldehyde 1-methyl-1-phenylhydrazone having the formula ##STR48## and a charge carrier producing material dispersed in said charge transport medium.
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) | 1987-06-12 | 1987-12-12 | 1988-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-06-12 | 1991-12-12 | 1992-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-06-12 | 1995-12-12 | 1996-06-12 | $7700.00 | Window Closed / Lapsed |