US4264694A
Expired / Lapsed
US
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Photosensitive medium for electrophotography having a cyanine photoconductive pigment
Assignee: Fujifilm Business Innovation Corp
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Filing: 1978-03-13
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Granted: 1981-04-28
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Expires: 1998-03-13
Abstract
Abstract A photosensitive medium for electrophotography which comprises a support having thereon a photoconductive layer comprising an organic photoconductive material and containing in a dispersed state a cyanine pigment which functions as a photoconductor expressed by the following general formula (I) ##STR1## in which A represents ##STR2## wherein B represents an aromatic group, a halogen atom, a nitro group, a cyano group, an acetoxy group, a styryl group, an alkylthio group, an alkoxy group, ##STR3## in which Z represents --O--, --Se--, ##STR4## or --S--, R 1 , R 2 , R 3 and R 4 , which may be the same or different, each represents an alkyl group or an allyl group, Y represents --S--, --Se--, --O--, ##STR5## X represents an anion, and the two benzene nuclei may include a carbocylic ring condensed therewith.
Inventors
- 👤 Lyong S. Pu
- 👤 Hitoshi Kamoda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 14:41
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/02; G03G5/04; G03G5/06; G03G5/0664; G03G5/0666; G03G5/0668; G03G5/067; C; C09; C09B; C09B23/00; C09B23/0008; C09B23/0016; C09B23/0025; C09B23/0033; C09B23/005; C09B23/0058; C09B23/02; C09B23/04; C09B23/06; C09B23/08; C09B23/083; C09B23/086; C09B23/10; C09B23/107
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
155 words
A photosensitive medium for electrography which comprises an electrically conductive support having thereon a photoconductive layer consisting essentially of a non-photoconductive binder and a cyanine pigment which functions as a photoconductor and which comprises particles having a size below about 5 microns but larger than molecular size expressed by the following general formula (I) ##STR12## in which A represents ##STR13## wherein B represents an aromatic group, a halogen atom, a nitro group, a cyano group, an acetoxy group, a styryl group, an alkylthio group, an alkoxy group, ##STR14## in which Z represents --O--, --Se--, ##STR15## or --S--, R 1 , R 2 , R 3 and R 4 , which may be the same or different, each represents an alkyl group or an allyl group, Y represents --S--, --Se--, --O--, ##STR16## X represents an anion, and the moiety in the above formula (I) can optionally represents a benzene ring fused to the terminal benzene ring.
Claim 2
Dependent Claim
155 words
A photosensitive medium for electrography which comprises an electrically conductive support having thereon a photoconductive layer consisting essentially of a non-photoconductive binder and a cyanine pigment which functions as a photoconductor and which comprises particles having a size below about 5 microns but larger than molecular size expressed by the following general formula (I) ##STR12## in which A represents ##STR13## wherein B represents an aromatic group, a halogen atom, a nitro group, a cyano group, an acetoxy group, a styryl group, an alkylthio group, an alkoxy group, ##STR14## in which Z represents --O--, --Se--, ##STR15## or --S--, R 1 , R 2 , R 3 and R 4 , which may be the same or different, each represents an alkyl group or an allyl group, Y represents --S--, --Se--, --O--, ##STR16## X represents an anion, and the moiety in the above formula (I) can optionally represents a benzene ring fused to the terminal benzene ring.
Claim 3
Dependent Claim
31 words
The photosensitive medium of claim 1, wherein said photoconductive layer comprises a charge-generating layer and a charge-transporting layer, both of which contains said cyanine pigment expressed by the general formula (I).
Claim 4
Dependent Claim
18 words
The photosensitive medium of claim 1, wherein said cyanine pigment particles are dispersed in an electrically insulating resin.
Claim 5
Dependent Claim
30 words
The photosensitive medium as claimed in claim 3, wherein said cyanine pigment is present in said electrically insulating resin in an amount of about 5 to 90% by weight thereof.
Claim 6
Dependent Claim
19 words
The photosensitive medium of claim 1, wherein said cyanine pigment particles are dispersed in a binder which is photoconductive.
Claim 7
Dependent Claim
19 words
The photosensitive medium of claim 1, wherein said cyanine pigment particles are dispersed in a binder which is non-photoconductive.
Claim 8
Dependent Claim
16 words
The photosensitive medium of claim 4, wherein said amount is 10 to 60% by weight thereof.
Claim 9
Dependent Claim
25 words
The photosensitive medium of claim 1, which exhibits a wide spectral sensitivity over the wavelength of visible light of about 4,000 to about 7,000 A.
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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) | 1984-04-27 | 1984-10-27 | 1985-04-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-04-27 | 1988-10-27 | 1989-04-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-04-27 | 1992-10-27 | 1993-04-28 | $7700.00 | Window Closed / Lapsed |