US3784375A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ectrostatic image forms a developable image in a silver salt
Assignee: Eastman Kodak Co
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Filing: —
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Granted: 1974-01-08
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Expires: 1991-01-08
Abstract
Abstract A process of rendering visible electrostatic charge patterns is described. The process involves the formation of a charge pattern on a charge-retaining member which is then placed in contact with an unexposed silver salt-containing element to form a latent image on the element which is then processed by standard photographic techniques to form a visible silver image. The process eliminates detrimental solvent and abrasive action which occur in standard electrophotographic development techniques.
Inventors
- 👤 P Gilman
- 👤 J Kaukeinen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:53
CPC Classifications
G; G03; G03G; G03G13/00; G03G13/22; G03C; G03C5/00; G03C5/04; G03D; G03D3/00; G03G13/14; G03G13/18; G03G5/00; G03G5/02
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
39 words
The process as described in claim 1 wherein said charge pattern is formed on an electrophotographic member comprised of a support having coated thereon a layer of a photoconductive composition comprised of at least one percent photoconductor by weight.
Claim 2
Dependent Claim
15 words
The process as described in claim 2 wherein said photoconductive composition contains an organic photoconductor.
Claim 3
Dependent Claim
21 words
The process as described in claim 1 wherein said element is comprised of a silver halide emulsion coated onto a support.
Claim 4
Dependent Claim
27 words
The process as described in claim 4 wherein said silver halide emulsion contains gelatin in a concentration of less than about 5 grams per mole of silver.
Claim 5
Dependent Claim
24 words
The process as described in claim 1 wherein said element is comprised of a support having thereon a layer of vacuum-deposited silver halide microcrystals.
Claim 6
Independent Claim
74 words
A method of forming visible images comprising the steps of forming an electrostatic charge pattern on a surface of a charge-bearing member, placing said surface in contact with the silver halide-bearing side of a silver halide element in the absence of electrical biasing and for a period of time sufficient to produce a latent image on said element, developing and fixing said element to produce a stable, visible image corresponding to said charge pattern.
Claim 7
Dependent Claim
18 words
A method as described in claim 7 wherein said charge-bearing member is comprised of an electrically insulating sheet.
Claim 8
Independent Claim
82 words
A method of forming visible images comprising the steps of electrophotographically forming an electrostatic charge pattern on an electrophotographic member comprised of a support having coated thereon a photoconductive layer comprised of at least one percent photoconductor by weight in an electrically insulating binder, placing said electrophotographic member in contact with the light-sensitive surface of a silver halide element for a period of time sufficient to produce a latent image, developing and fixing said latent image to form a stable, visible image.
Claim 9
Dependent Claim
23 words
The method as described in claim 9 wherein said electrophotographic member has a spectral sensitivity different from that of said silver halide element.
Claim 10
Dependent Claim
27 words
The method as described in claim 9 wherein said silver halide element is comprised of a support having coated thereon a layer of vacuum-deposited silver halide microcrystals.
Claim 11
Dependent Claim
24 words
The method as described in claim 9 wherein said silver halide element is comprised of a support having coated thereon a silver halide emulsion.
Claim 12
Dependent Claim
27 words
The method as described in claim 12 wherein said silver halide emulsion contains gelatin in a concentration of less than about 5 grams per mole of silver.
Claim 13
Independent Claim
98 words
A method of forming visible images comprising the steps of forming an electrostatic charge pattern on a photoconductor grid by means of a corona source, placing said photoconductive grid above an insulating sheet covering the silver salt-bearing layer of a silver salt element, reactivating the corona source to produce a charge pattern on said insulating sheet in the absence of electrical biasing with respect to the insulating sheet and the silver salt element, stripping said insulating sheet and said silver salt element apart to produce a latent image, and developing said latent image to produce a visible image.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-01-07 | 1977-07-09 | 1978-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-07 | 1981-07-09 | 1982-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-07 | 1985-07-09 | 1986-01-08 | $7700.00 | Window Closed / Lapsed |