US3830648A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photoconductor-glass binder plate with insulating resin in pores
Assignee: Varian Medical Systems Inc
•
Filing: 1973-01-12
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Granted: 1974-08-20
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Expires: 1993-01-12
Abstract
Abstract An electrophotographic charge image transfer plate, of the type comprising a matrix of interconnected photoconductive crystals bound into a glass binder to form a porous photoconductive charge transfer layer bonded to an underlying electrically conductive photon transparent substrate, has its charge transfer characteristics stabilized by infiltrating an electrically insulative material into the porous surface of the photoconductive layer. The infiltrated insulative material coats the interior surfaces of the porous glass coated and bound layer with a coating of the insulative material, whereby the charge transfer characteristics of the charge transfer plate are stabilized.
Inventors
- 👤 S Rutherford
- 👤 M Feinieib
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 09:24
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/14; G03G13/00; G03G13/14; G03G13/18; G03G5/02; G03G5/04; G03G5/08; G03G5/085
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
18 words
The method of claim 1 in which said resin is applied by spraying in a volatile liquid vehicle.
Claim 2
Dependent Claim
15 words
The method of claim 2 in which the insulating organic resin comprises an acrylic resin.
Claim 3
Dependent Claim
20 words
The method of claim 3 in which excess resin is removed by washing with a solvent for said acrylic resin.
Claim 4
Dependent Claim
183 words
An electrophotographic charge image transfer member comprising: photon transparent electrically conductive substrate means; an inorganic photoconductive layer overlaying the substrate means and being bonded thereto; the photoconductive layer comprising a matrix of inorganic photoconductive crystals in a glass binder, the glass comprising between about 5 to about 40 percent by weight of the photoconductive layer; the photoconductive layer being porous and having an external surface adapted to be disposed facing and in nominal contact with a dielectric charge retentive layer of an electrographic recording web for transfer of the charge image to the charge retentive layer in response to illumination by a photon image and simultaneous application of a charge transfer potential across the charge image transfer member and the web; pores of said photoconductive layer in communication with said external surface having infiltrated therein an insulative organic resin for stabilizing the charge image transfer characteristics of the charge image transfer member, such resin in said photoconductive layer being on average less than about 1 micron thick at said external surface; and said external surface having pores communicating with pores in said layer.
Claim 5
Dependent Claim
30 words
The electrophotographic charge image transfer member of claim 5, wherein the insulative organic material is a resin selected from the group consIsting of acrylic, epoxy, ethyl cellulose, and vinyl resin.
Claim 6
Dependent Claim
17 words
The electrophotographic charge image transfer member of claim 5, in which the photoconductive crystals comprise cadmium sulfide.
Claim 7
Dependent Claim
17 words
The electrophotographic charge image transfer member of claim 5, in which the resin comprises an acrylic resin.
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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) | 1977-08-19 | 1978-02-18 | 1978-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-19 | 1982-02-18 | 1982-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-19 | 1986-02-18 | 1986-08-20 | $7700.00 | Window Closed / Lapsed |