Patent US2720105A successfully refreshed from Google Patents.
US3673472A
Expired / Lapsed
US
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Electrostatic photocopying machine
Assignee: ICP Inc
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Filing: 1970-03-23
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Granted: 1972-06-27
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Expires: 1990-03-23
Abstract
Abstract A high voltage means for an electrostatic photocopy machine for charging photosensitive copy paper so that an image of an original document may be superimposed thereon. A wire connected to the high voltage side of a high voltage source is spaced from the sensitive side of the copy paper. A roller positioned in an opposed relationship with the wire moves the copy paper through the high voltage means. The peripheral edge of the roller is electrically conductive and connected to the reference voltage side of the high voltage.
Inventors
- 👤 Raymond B J Liebens
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 04:56
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/02; G03G15/0291
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
136 words
In an electrostatic photocopying machine of the type wherein photosensitive copy paper is electrostatically charged before photocopying an image of an original document onto said charged copy paper, electrostatic means for charging said copy paper comprising: a high voltage source having a first terminal and a second terminal; a wire electrode connected to one of said terminals; a roller having an electrical conducting surface, said surface being connected to the other said terminal, said wire electrode and said roller being spaced apart in substantially parallel relationship to provide therebetween a charging zone through which copy paper may be passed to acquire an electrostatic charge; and a brush comprising a plurality of electrically conductive hairs disposed adjacent said roller but remote from said wire electrode, the outer tips of said hairs contacting the surface of said roller.
Claim 2
Dependent Claim
136 words
In an electrostatic photocopying machine of the type wherein photosensitive copy paper is electrostatically charged before photocopying an image of an original document onto said charged copy paper, electrostatic means for charging said copy paper comprising: a high voltage source having a first terminal and a second terminal; a wire electrode connected to one of said terminals; a roller having an electrical conducting surface, said surface being connected to the other said terminal, said wire electrode and said roller being spaced apart in substantially parallel relationship to provide therebetween a charging zone through which copy paper may be passed to acquire an electrostatic charge; and a brush comprising a plurality of electrically conductive hairs disposed adjacent said roller but remote from said wire electrode, the outer tips of said hairs contacting the surface of said roller.
Claim 3
Dependent Claim
54 words
The photocopying machine of claim 1 wherein an elongated infeed guide plate is provided adjacent said roller in substantially tangential relation with the portion of said roller nearest said wire electrode so that copy paper fed across said guide plate to said roller is in engagement therewith as it passes through said charging zone.
Claim 4
Dependent Claim
40 words
The photocopying machine of claim 2 wherein a roller drive means is provided for rotating the roller at a peripheral rate of rotational movement of at least substantially the rate of movement of the copy paper through the photocopy machine.
Claim 5
Dependent Claim
38 words
The photocopying machine of claim 2 wherein said first terminal of said high voltage source is at a high voltage, said second terminal is at a reference voltage and said wire electrode is connected to said first terminal.
Claim 6
Dependent Claim
22 words
The photocopying machine of claim 1 wherein said brush provides a substantially low resistance path from said roller to said reference voltage.
Claim 7
Dependent Claim
18 words
The photocopying machine of claim 5 wherein said reference voltage is at the ground potential of the machine.
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) | 1975-06-27 | 1975-12-27 | 1976-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-27 | 1979-12-27 | 1980-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-27 | 1983-12-27 | 1984-06-27 | $7700.00 | Window Closed / Lapsed |