US4233385A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for liquid electrostatic development of charge images on a tape-like record carrier
Assignee: US Philips Corp
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Filing: 1977-08-15
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Granted: 1980-11-11
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Expires: 1997-08-15
Abstract
Abstract A method of liquid development of charge images formed on a surface of a tape-like record carrier, for example by an electrostatic printer. The record carrier is simultaneously sprayed with developer liquid in two flows which are directed towards each other. As a result, two separate, uniform and oppositely directed flow zones meeting at one common turbulent flow zone are obtained. Both during pre-development and final developement the charge images are brought into contact with a large quantity of fresh developer liquid.
Inventors
- 👤 Hans-Dieter Hinz
- 👤 Ulf Rothgordt
- 👤 Franz Schinke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 05:29
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/06; G03G15/10
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
142 words
A method of electrostatic development of electrostatic charge images impressed on a surface of a smooth, tape-like record carrier in a liquid, by guiding the carrier through a developer tank through which developer liquid is continuously flowing, comprising: spraying a first flow of developer liquid against the surface of the record carrier on which the charge image is formed so as to form a first uniform flow zone, spraying a second flow of developer liquid against the surface of the record carrier on which the charge image is formed so as to form a second uniform flow zone, the liquid in said first and second flows flowing toward each other on said surface, and the liquid in said first and second flow zones flowing on said surface to a common turbulent flow zone at the meeting of the two uniform flow zones.
Claim 2
Independent Claim
142 words
A method of electrostatic development of electrostatic charge images impressed on a surface of a smooth, tape-like record carrier in a liquid, by guiding the carrier through a developer tank through which developer liquid is continuously flowing, comprising: spraying a first flow of developer liquid against the surface of the record carrier on which the charge image is formed so as to form a first uniform flow zone, spraying a second flow of developer liquid against the surface of the record carrier on which the charge image is formed so as to form a second uniform flow zone, the liquid in said first and second flows flowing toward each other on said surface, and the liquid in said first and second flow zones flowing on said surface to a common turbulent flow zone at the meeting of the two uniform flow zones.
Claim 3
Dependent Claim
46 words
A method as claimed in claim 1 wherein said first flow spraying causes developer flow in said first flow zone in the direction of carrier movement, and said second flow spraying step causes developer flow in said second zone opposite to the direction of carrier movement.
Claim 4
Dependent Claim
36 words
A method as claimed in claim 2 wherein said common turbulent zone is near the bottom of the developer tank, and in said first and second zones the carrier is moved in opposite generally vertical directions.
References Cited (Backward Citations)
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US3336906A
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US3799791A
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US3577259A
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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) | 1983-11-11 | 1984-05-12 | 1984-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-11-11 | 1988-05-12 | 1988-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-11-11 | 1992-05-12 | 1992-11-11 | $7700.00 | Window Closed / Lapsed |