US3915703A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photoconductive composition and element employing a sensitizer and a light filtering substance
Assignee: Hitachi Ltd
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Filing: 1973-07-25
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Granted: 1975-10-28
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Expires: 1993-07-25
Abstract
Abstract A photoconductive material comprises a photoconductor, a sensitizer and a light filtering substance such as a dye or pigment which itself displays substantially no sensitizing action, but is capable of absorbing light of an undesired wave length, whereby the wave length region to which the photoconductor is sensitive is controlled by filter effect of the light filtering substance so that the photoconductor is rendered sensitive only to light of a specific wave length region.
Inventors
- 👤 Yaski Mori
- 👤 Hirosada Morishita
- 👤 Nobuhiko Shito
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 09:50
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/12; G03G13/00; G03G13/01; G03G5/02; G03G5/04; G03G5/09
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
115 words
A PHOTOCONDUCTOR MIXTURE SENSITIVE TO LIGHT OF A LIMITED REGION OF THE SPECTRUM COMPRISNG A PHOTOCONDUCTOR, AT LAST ONE SENSITIZER DYE SENSITIVE TO LIGHT IN A BROARDER REGION OF THE SPECTRUM THAN SAID LIMITED REGION, SAID BROADER REGION INCLUDING SAID LIMITING REGION, AND AT LEAST ONE DYESTUFF OR PIGMENT ABSORBING LIGHT IN SAID BROADER EXCEPT FOR LIGHT IN SAID LIMITING REGION WHEREBY UNDESIRED SENSITIZING OF SAID PHOTOCONDUCTOR BY LIGHT OUTSIDE SAID LIMITED REGION IS PREVENTED SAID MIXTURE CONTAINING 5 TO 30 PARTS BY WEIGHT OF SAID AT LAST ONE DYSTUFF OR PIGMENT AND 0.003 O 10 PARTS BY WEIGHT OF SAID AT LEAST ONE SENSITIZER DYE BASED ON 100 PARTS BY WEIGHT OF SAID PHOTOCONDUCTOR.
Claim 2
Dependent Claim
115 words
A PHOTOCONDUCTOR MIXTURE SENSITIVE TO LIGHT OF A LIMITED REGION OF THE SPECTRUM COMPRISNG A PHOTOCONDUCTOR, AT LAST ONE SENSITIZER DYE SENSITIVE TO LIGHT IN A BROARDER REGION OF THE SPECTRUM THAN SAID LIMITED REGION, SAID BROADER REGION INCLUDING SAID LIMITING REGION, AND AT LEAST ONE DYESTUFF OR PIGMENT ABSORBING LIGHT IN SAID BROADER EXCEPT FOR LIGHT IN SAID LIMITING REGION WHEREBY UNDESIRED SENSITIZING OF SAID PHOTOCONDUCTOR BY LIGHT OUTSIDE SAID LIMITED REGION IS PREVENTED SAID MIXTURE CONTAINING 5 TO 30 PARTS BY WEIGHT OF SAID AT LAST ONE DYSTUFF OR PIGMENT AND 0.003 O 10 PARTS BY WEIGHT OF SAID AT LEAST ONE SENSITIZER DYE BASED ON 100 PARTS BY WEIGHT OF SAID PHOTOCONDUCTOR.
Claim 3
Dependent Claim
29 words
A photoconductive material according to claim 1, wherein said sensitizer absorbs mainly green light and said light filtering substance is capable of absorbing light other than sAid green light.
Claim 4
Dependent Claim
71 words
a second photoconductive composition comprising a photoconductor sensitive to the visible light; a sensitizing amount of a sensitizer capable of absorbing red light for enhancing sensitivity of said second photoconductive composition with respect to said red light; and a light filtering substance insensitive to said visible light and capable of absorbing light other than the red light, whereby said second photoconductive composition is rendered sensitive only to said red light; and
Claim 5
Dependent Claim
71 words
a second photoconductive composition comprising a photoconductor sensitive to the visible light; a sensitizing amount of a sensitizer capable of absorbing red light for enhancing sensitivity of said second photoconductive composition with respect to said red light; and a light filtering substance insensitive to said visible light and capable of absorbing light other than the red light, whereby said second photoconductive composition is rendered sensitive only to said red light; and
Claim 6
Dependent Claim
70 words
a third photoconductive composition comprising a photoconductor sensitive to the visible light; a sensitizing amount of a sensitizer capable of absorbing blue light for enhancing sensitivity of said third photoconductive composition with respect to said blue light; and a light filtering substance insensitive to said visible light and capable of absorbing light other than the blue light, whereby said third photoconductive composition is rendered sensitive only to said blue light.
Claim 7
Dependent Claim
70 words
a third photoconductive composition comprising a photoconductor sensitive to the visible light; a sensitizing amount of a sensitizer capable of absorbing blue light for enhancing sensitivity of said third photoconductive composition with respect to said blue light; and a light filtering substance insensitive to said visible light and capable of absorbing light other than the blue light, whereby said third photoconductive composition is rendered sensitive only to said blue light.
Claim 8
Dependent Claim
46 words
A photoconductive material according to claim 2, wherein said mixture contains yellowish or orange dyestuff or pigment for filtering light having smaller wave lengths than green light and a green, blue or violet dye or pigment for filtering light having larger wave lengths than green light.
Claim 9
Dependent Claim
29 words
A photoconductive material according to claim 1, wherein said sensitizer absorbs mainly red light and said light filtering substance is capable of absorbing light other than said red light.
Claim 10
Dependent Claim
25 words
The photoconductive material of claim 4, wherein said mixture contains a red dye or pigment for filtering light having smaller wave lengths than red light.
Claim 11
Dependent Claim
29 words
A photoconductive material according to claim 1, wherein said sensitizer absorbs mainly blue light and said light filtering substance is capable of absorbing light other than said blue light.
Claim 12
Dependent Claim
26 words
A photoconductive material according to claim 6, wherein said mixture contains an orange dye or pigment for filtering light having larger wave lengths than blue light.
Claim 13
Dependent Claim
25 words
A photoconductive material according to claim 1, wherein the photoconductor is selected from the group consisting of selenium, zinc oxide, titanium oxide and cadmium sulfide.
Claim 14
Dependent Claim
26 words
A photoconductive material according to claim 1, wherein the photoconductor is an organic polymer selected from the group consisting of an aromatic and heterocyclic vinyl polymers.
Claim 15
Dependent Claim
29 words
A photoconductive element comprising three kinds of homogeneous mixtures, each being regularly arranged in mosaic pattern on an electroconductive support, said homogeneous mixtures including the following three photoconductive compositions:
Claim 16
Dependent Claim
29 words
A photoconductive element comprising three kinds of homogeneous mixtures, each being regularly arranged in mosaic pattern on an electroconductive support, said homogeneous mixtures including the following three photoconductive compositions:
Claim 17
Dependent Claim
20 words
The photoconductive element of claim 10, wherein the light filtering substance in each photoconductive composition is a dyestuff or pigment.
Claim 18
Dependent Claim
34 words
A photoconductive element according to claim 10 wherein amount of the light filtering substance added to each photoconductive composition is 5 - 30 parts by weight per 100 parts by weight of the photoconductor.
Claim 19
Dependent Claim
32 words
A photoconductive element according to claim 12, wherein amount of said sensitizer added to each photoconductive composition is 0.003 - 10 parts by weight per 100 parts by weight of the photoconductor.
Claim 20
Dependent Claim
20 words
The photoconductive element of claim 13, wherein the light filtering substance in each photoconductive composition is a dyestuff or pigment.
Claim 21
Dependent Claim
122 words
An electrophotographic recording material for making multicolored images comprising a mosaic-like-divided phoToconductive film having at least one photoconductor, at least two sensitizer dyes, and at least two dyestuffs or pigments, wherein each individual section of the mosaic is sensitive to light of a limited region of the spectrum, each section of the mosaic containing a sensitizer dye sensitive to light in a broader region of the spectrum than in the corresponding limited region, said broader region including said corresponding limited region, and a dyestuff or pigment absorbing light in said broader region except for light in said corresponding limited region whereby undesired sensitizing of the photoconductor in each section of the mosaic by light outside of the corresponding limited region is prevented.
Claim 22
Dependent Claim
122 words
An electrophotographic recording material for making multicolored images comprising a mosaic-like-divided phoToconductive film having at least one photoconductor, at least two sensitizer dyes, and at least two dyestuffs or pigments, wherein each individual section of the mosaic is sensitive to light of a limited region of the spectrum, each section of the mosaic containing a sensitizer dye sensitive to light in a broader region of the spectrum than in the corresponding limited region, said broader region including said corresponding limited region, and a dyestuff or pigment absorbing light in said broader region except for light in said corresponding limited region whereby undesired sensitizing of the photoconductor in each section of the mosaic by light outside of the corresponding limited region is prevented.
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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) | 1978-10-27 | 1979-04-28 | 1979-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-27 | 1983-04-28 | 1983-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-27 | 1987-04-28 | 1987-10-28 | $7700.00 | Window Closed / Lapsed |