US3609031A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of forming electrostatic latent images
Assignee: Katsuragawa Electric Co Ltd
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Filing: 1969-06-05
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Granted: 1971-09-28
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Expires: 1989-06-05
Abstract
Abstract In a method of forming an electrostatic latent image by the steps of applying a first electric field across a photosensitive element including a photosensitive layer and a highly insulative layer so as to deposit a first uniform change of one polarity upon the surface of the highly insulative layer and to establish a uniform charge distribution in the photosensitive layer, applying a second electric field across the photosensitive element to deposit a second charge of the opposite polarity and projecting a light image upon the photosensitive element concurrently with the application of the second field, the second field is applied in two spaced-apart periods and the light image is projected between the periods.
Inventors
- 👤 Koichi Kinoshita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 08:20
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/02; G03G5/04; G03G5/043; G03G5/0433; G03G15/00; G03G15/056; G03G5/0436; G03G5/08; G03G5/14; G03G5/147
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
25 words
The method of forming an electrostatic latent image according to claim 1 wherein said first and second fields are applied by corona discharge electrode units.
Claim 2
Dependent Claim
36 words
The method of forming an electrostatic latent image according to claim 1 wherein said electrostatic latent image formed on the surface of said highly insulated layer is subjected to light irradiation and developed under ambient light.
Claim 3
Dependent Claim
156 words
An electrophotographic apparatus comprising a photosensitive element including a photosensitive layer manifesting persistent internal polarization and a highly insulative layer integrally bonded to said photosensitive layer, a first corona discharge electrode unit to deposit a charge of first polarity on the surface of said highly insulative layer, spaced-apart second and third corona discharge electrode units to deposit a charge of the opposite polarity on the surface of said highly insulative layer, means interposed between said second and third corona discharge electrode units to project a light image on said photosensitive element, whereby to form an electrostatic latent image on the surface of said highly insulative layer corresponding to said projected light image, means to develop said latent image as a powder image, means to transfer print said powder image onto a receptive medium, means to clean the surface of said photosensitive element and means for moving said photosensitive element relative to other elements of the apparatus.
Claim 4
Dependent Claim
33 words
The electrophotographic apparatus according to claim 4 wherein said apparatus further comprises means interposed between said third corona discharge electrode unit and said developing means to irradiate said photosensitive element with uniform light.
Claim 5
Dependent Claim
54 words
The electrophotographic apparatus according to claim 4 wherein said photosensitive element is wrapped around a rotary cylinder with said highly insulative layer faced outwardly, and said first to third corona discharge electrode units, light image projecting means, said developing means, transfer means and cleaning means are disposed around the periphery of said photosensitive element.
References Cited (Backward Citations)
US3041167A
Cited
US3307034A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-27 | 1975-03-29 | 1975-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-27 | 1979-03-29 | 1979-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-27 | 1983-03-29 | 1983-09-28 | $7700.00 | Window Closed / Lapsed |