US4626485A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Substituted squarium compounds, process for preparing the same and electrophotographic photoreceptors containing the same
Assignee: Fujifilm Business Innovation Corp
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Filing: 1985-05-13
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Granted: 1986-12-02
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Expires: 2005-05-13
Abstract
Abstract Novel squarium compounds which have a flat photosensitivity in the wide range from visible ray region to the near infrared ray region as a charge generator and which can be prepared by reacting squaric acid and an aniline derivative, and electrophotographic photoreceptors containing the squarium compounds are disclosed.
Inventors
- 👤 Seki Kin
- 👤 Hiroyuki Tanaka
- 👤 Satoshi Saeki
- 👤 Kaoru Torikoshi
- 👤 Lyong S. Pu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 16:53
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/02; G03G5/04; G03G5/06; G03G5/0601; G03G5/0609; G03G5/0611; G03G5/0618
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
30 words
An electrophotographic photoreceptor comprising an electroconductive support and a photosensitive layer comprising a squarium compound represented by formula (I): ##STR10## wherein X is a nitro group or a cyano group.
Claim 2
Dependent Claim
30 words
An electrophotographic photoreceptor comprising an electroconductive support and a photosensitive layer comprising a squarium compound represented by formula (I): ##STR10## wherein X is a nitro group or a cyano group.
Claim 3
Dependent Claim
26 words
An electrophotographic photoreceptor as claimed in claim 1, wherein said photosensitive layer comprises a charge transport layer and a charge generation layer containing said squarium compound.
Claim 4
Dependent Claim
28 words
An electrophotographic photoreceptor as claimed in claim 2, wherein said charge transport layer comprises a photoconductive polymer selected from the group consisting of polyvinyldibenzothiophene, polyvinylpyrene, polyvinylanthracene and polyvinylcarbazole.
Claim 5
Dependent Claim
32 words
An electrophotographic photoreceptor as claimed in claim 2, wherein said charge transport layer comprises a compound selected from the group consisting of triarylpyrazoline, triphenylmethane, oxadiazole, tetraphenylbenzidine or trinitrofluororenone and a binder resin.
Claim 6
Dependent Claim
20 words
An electrophotographic photoreceptor as claimed in claim 2, wherein said charge generation layer is comprised substantially of said squarium compound.
Claim 7
Dependent Claim
37 words
An electrophotographic photoreceptor as claimed in claim 2, wherein said charge generation layer comprises said squarium compound in an amount of from about 10 to 90 weight percent based on the weight of said charge generation layer.
Claim 8
Dependent Claim
34 words
An electrophotographic photoreceptor as claimed in claim 6, wherein said squarium compound is present in an amount of from about 10 to 50 weight percent based on the weight of said charge generation layer.
Claim 9
Dependent Claim
21 words
An electrophotographic photoreceptor as claimed in claim 2, wherein said charge generation layer is from about 0.1 to 3 micron thick.
Claim 10
Dependent Claim
29 words
An electrophotographic photoreceptor as claimed in claim 8, wherein the thickness ratio of said charge generation layer to said charge transport layer is from about 1/2 to about 1/200.
Claim 11
Dependent Claim
23 words
An electrophotographic photoreceptor as claimed in claim 2, wherein said charge generation layer is present between said support and said charge transport layer.
Claim 12
Dependent Claim
23 words
An electrophotographic photoreceptor as claimed in claim 2, wherein said charge transport layer is present between said support and said charge generation layer.
Claim 13
Dependent Claim
24 words
An electrophotographic photoreceptor as claimed in claim 1, wherein said photosensitive layer comprises a layer containing said squarium compound and a charge transport material.
Claim 14
Dependent Claim
24 words
An electrophotographic photoreceptor as claimed in claim 2, wherein said squarium compound is dispersed in the form of particles in said charge generation layer.
References Cited (Backward Citations)
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Cited
US4523035A
Cited
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Cited
US4524219A
Cited
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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) | 1989-12-01 | 1990-06-02 | 1990-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-12-01 | 1994-06-02 | 1994-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-12-01 | 1998-06-02 | 1998-12-02 | $7700.00 | Window Closed / Lapsed |