Patent US3971658A successfully refreshed from Google Patents.
US3971658A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Imaging process employing friction charging in the presence of an electrically insulating liquid
Assignee: Xerox Corp
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Filing: 1975-04-24
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Granted: 1976-07-27
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Expires: 1995-04-24
Abstract
Abstract Friction charging of insulating and photoconductive insulating members is accomplished in the presence of an insulating liquid. In a preferred embodiment, the insulating liquid is a developer liquid and the friction charging step may simultaneously erase a previously developed image.
Inventors
- 👤 William L. Goffe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:54
CPC Classifications
G; G03; G03G; G03G13/00; G03G13/02; G03G13/025; G03G2215/00; G03G2215/02; G03G2215/021
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
95 words
An imaging process comprising: a. providing a photoconductive insulating layer on an electrically conductive substrate; b. friction charging said photoconductive insulating layer with a second material in the presence of an electrically insulating layer until an electrostatic charge is produced on said photoconductive insulating layer, said second material differing in triboelectric character from said photoconductive insulating layer; c. exposing said photoconductive insulating layer to an imagewise pattern of radiation to which said photoconductive insulating layer is responsive; and d. contacting said photoconductive insulating layer with an electrically insulating developer liquid until an image is formed.
Claim 2
Dependent Claim
95 words
An imaging process comprising: a. providing a photoconductive insulating layer on an electrically conductive substrate; b. friction charging said photoconductive insulating layer with a second material in the presence of an electrically insulating layer until an electrostatic charge is produced on said photoconductive insulating layer, said second material differing in triboelectric character from said photoconductive insulating layer; c. exposing said photoconductive insulating layer to an imagewise pattern of radiation to which said photoconductive insulating layer is responsive; and d. contacting said photoconductive insulating layer with an electrically insulating developer liquid until an image is formed.
Claim 3
Dependent Claim
29 words
The process of claim 1 wherein said photoconductive insulating layer is overcoated with an electrically insulating third material, said third material differing in triboelectric character from said second material.
Claim 4
Dependent Claim
35 words
The process of claim 1 wherein said photoconductive insulating layer is overcoated in a screen pattern with an electrically insulating material having a triboelectric character differing from the photoconductive insulating material and said second material.
Claim 5
Dependent Claim
13 words
The process of claim 1 wherein steps (b) and (c) are performed concurrently.
Claim 6
Dependent Claim
18 words
The process of claim 1 wherein steps (b), (c) and (d) are repeated at least one additional time.
Claim 7
Dependent Claim
22 words
The process of claim 1 wherein said electrically insulating developer liquid forms a thin film and said image is an interference pattern.
Claim 8
Dependent Claim
21 words
The process of claim 1 wherein said electrically insulating developer liquid contains marking particles and said image comprises deposited marking particles.
Claim 9
Dependent Claim
27 words
The process of claim 1 wherein said electrically insulating developer liquid contains a material which forms a solid thin film and said image comprises an interference pattern.
Claim 10
Dependent Claim
31 words
The process of claim 1 wherein said electrically insulating developer liquid comprises a liquid crystal material and said image comprises a difference in color or opacity within said liquid crystal 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) | 1979-07-27 | 1980-01-26 | 1980-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-07-27 | 1984-01-26 | 1984-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-07-27 | 1988-01-26 | 1988-07-27 | $7700.00 | Window Closed / Lapsed |