US4664502A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid developing apparatus for use in electrophotographic copying machine
Assignee: Dainippon Screen Manufacturing Co Ltd
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Filing: 1985-05-22
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Granted: 1987-05-12
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Expires: 2005-05-22
Abstract
Abstract Apparatus for an electrostatic copying machine using a liquid developer or toner includes a pair of electrodes for developing the latent image on the electrostatically charged photosensitive sheet, of which the auxiliary or back electrode has a specially grooved surface such that the contact area with the sheet is smaller at the front and rear ends of the auxiliary electrode than at the central portion. In one embodiment, the grooves comprise two series of uniformly spaced identical circular arcs, the two series having opposite curvatures for intersection and defining the contact areas.
Inventors
- 👤 Masao Fukushima
- 👤 Iwao Hirose
- 👤 Yoshio Miyauchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 09:56
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/06; G03G15/10; G03G15/108
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
86 words
An apparatus for developing a latent electrostatic image on a photosensitive sheet by contact with a liquid developer, comprising a main electrode and an auxiliary electrode disposed face to face for forming a common passageway for the developer of which at least the auxiliary electrode includes on its face a plurality of grooves for defining projecting portions for contact with the sheet characterized in that the projecting portions form smaller contact areas at the upstream and downstream portions of the passageway than at the intermediate portion.
Claim 2
Independent Claim
86 words
An apparatus for developing a latent electrostatic image on a photosensitive sheet by contact with a liquid developer, comprising a main electrode and an auxiliary electrode disposed face to face for forming a common passageway for the developer of which at least the auxiliary electrode includes on its face a plurality of grooves for defining projecting portions for contact with the sheet characterized in that the projecting portions form smaller contact areas at the upstream and downstream portions of the passageway than at the intermediate portion.
Claim 3
Dependent Claim
40 words
The apparatus of claim 1 further characterized in that the grooves form two series of uniformly spaced identical circular arcs, each arc extending between the upstream and downstream ends of the passageway, the arcs of each series having opposite curvatures.
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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) | 1990-05-11 | 1990-11-10 | 1991-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-05-11 | 1994-11-10 | 1995-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-05-11 | 1998-11-10 | 1999-05-12 | $7700.00 | Window Closed / Lapsed |