US4026702A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photoconductive element having a layer including a photoconductive cadmium compound and hydrophobic colloidal silica
Assignee: Canon Production Printing Holding BV
•
Filing: 1975-11-28
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Granted: 1977-05-31
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Expires: 1995-11-28
Abstract
Abstract The electrophotographic properties of photoconductive elements sensitized by a cadmium sulfide-binder layer are improved by incorporating hydrophobic colloidal silica in the photoconductive layer.
Inventors
- 👤 Michiel van den Brink
- 👤 Andreas C. Stoot
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 06:18
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/02; G03G5/04; G03G5/08; G03G5/087; G03G5/05; G03G5/0503; G03G5/0507
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
54 words
Photoconductive element which comprises a support carrying a photoconductive layer, said layer comprising a photoconductive cadmium compound selected from the group consisting of photoconductive cadmium sulphide, cadmium selenide and cadmium sulphoselenide dispersed in an organic polymeric binder and hydrophobic colloidal silica dispersed therein in an amount sufficient to enhance electrophotographic properties of said layer.
Claim 2
Dependent Claim
54 words
Photoconductive element which comprises a support carrying a photoconductive layer, said layer comprising a photoconductive cadmium compound selected from the group consisting of photoconductive cadmium sulphide, cadmium selenide and cadmium sulphoselenide dispersed in an organic polymeric binder and hydrophobic colloidal silica dispersed therein in an amount sufficient to enhance electrophotographic properties of said layer.
Claim 3
Dependent Claim
27 words
Photoconductive element according to claim 1 wherein said layer contains 2 to 6% by weight of hydrophobic colloidal silica calculated on the weight of the cadmium compound.
Claim 4
Dependent Claim
21 words
Photoconductive element according to claim 1 wherein the hydrophobic colloidal silica has an average particle size of 7 to 100 nanometer.
Claim 5
Dependent Claim
41 words
Photoconductive element according to claim 1, said layer containing by weight 1 to 7 parts of photoconductive cadmium sulphide per part of said binder and 2 to 6% of hydrophobic colloidal silica calculated on the weight of the cadmium sulphide content.
Claim 6
Dependent Claim
48 words
Process for producing a copy by electrophotography which process comprises imagewise exposing to light the photoconductive layer of a photoconductive element as claimed in claim 1 and transferring the resulting latent image or a powder image developed on it from said layer to a sheet of receiving material.
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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) | 1980-05-30 | 1980-11-29 | 1981-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-30 | 1984-11-29 | 1985-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-30 | 1988-11-29 | 1989-05-31 | $7700.00 | Window Closed / Lapsed |