Patent US4076637A successfully refreshed from Google Patents.
Patent US4346982A successfully refreshed from Google Patents.
US4346982A
Expired / Lapsed
US
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Electrophotographic recording device
Assignee: Fujitsu Ltd
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Filing: 1980-04-11
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Granted: 1982-08-31
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Expires: 2000-04-11
Abstract
Abstract An electrophotographic recording device suitable for a Form Overlay System, by which a latent image is formed on a surface of a light-sensitive recording medium, consisting of a first area which is maintained at an original potential, a second area which is maintained at a partially reduced potential and a third area which is maintained at a potential of zero.
Inventors
- 👤 Junzo Nakajima
- 👤 Masayuki Hida
- 👤 Masakatsu Horie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:56
CPC Classifications
B; B41; B41J; B41J29/00; B41J29/40; G; G03; G03G; G03G15/00; G03G15/04; G03G15/04036; G03G15/04045; G03G15/04072
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
122 words
An electrophotographic recording device comprising: a light-sensitive recording medium, means for uniformly pre-charging the surface of said light-sensitive recording medium, means for forming a latent image of a picture on the charged lightsensitive recording medium by exposure of a positive optical image of the picture, means for forming latent images of characters on the charged light-sensitive recording medium by exposure of negative optical images of the characters, and means for development of the latent images formed on the light-sensitive recording medium including a magnetic roller having a potential selected as a predetermined value between the potential of the precharged light-sensitive recording medium and zero potential and single component toner for development of said latent images of both the picture and the characters.
Claim 2
Dependent Claim
122 words
An electrophotographic recording device comprising: a light-sensitive recording medium, means for uniformly pre-charging the surface of said light-sensitive recording medium, means for forming a latent image of a picture on the charged lightsensitive recording medium by exposure of a positive optical image of the picture, means for forming latent images of characters on the charged light-sensitive recording medium by exposure of negative optical images of the characters, and means for development of the latent images formed on the light-sensitive recording medium including a magnetic roller having a potential selected as a predetermined value between the potential of the precharged light-sensitive recording medium and zero potential and single component toner for development of said latent images of both the picture and the characters.
Claim 3
Dependent Claim
46 words
An electrophotographic recording device as defined in claim 1, wherein the formation of the latent image on the light-sensitive recording medium for the positive optical image is effected prior to the formation of the latent image on the light-sensitive recording medium for the negative optical image.
Claim 4
Dependent Claim
46 words
An electrophotographic recording device as defined in claim 1, wherein the formation of the latent image on the light-sensitive recording medium for the negative optical image is effected prior to the formation of the latent image on the light-sensitive recording medium of the positive optical image.
Claim 5
Dependent Claim
16 words
The device of claim 1 wherein said character forming means comprises an optical fiber tube system.
Claim 6
Dependent Claim
15 words
The device of claim 1 wherein said character forming means comprises a semiconductor laser system.
Claim 7
Dependent Claim
103 words
The device of claim 1, 4 or 5, wherein said picture and character forming means form latent images on said light-sensitive recording medium consists of a first area which does not receive any light of said negative or positive optical image and holds an original potential, a second area which receives the light of only said positive optical image and holds a reduced potential from that of said original potential and a third area which receives the light of both said negative optical image and said positive optical image and holds a further reduced potential than said reduced potential of said second area.
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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) | 1985-08-30 | 1986-03-01 | 1986-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-08-30 | 1990-03-01 | 1990-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-08-30 | 1994-03-01 | 1994-08-31 | $7700.00 | Window Closed / Lapsed |