US4342823A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Perforate development electrode
Assignee: Warren SD Co
•
Filing: 1979-08-14
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Granted: 1982-08-03
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Expires: 1999-08-14
Abstract
Abstract A method for developing electrostatic images on a sheet of electro-photographic material by means of a perforate development electrode and liquid toner, without immersing the material in a bath of toner. The method comprises spraying liquid toner against pressure reducing means adjacent to the electrode to reduce and make uniform the pressure of the flowing liquid toner and flowing the liquid toner uniformly over and through the perforate development electrode and over the image side of the sheet without contacting the side opposite the image side with the toner.
Inventors
- 👤 Clyde P. Grant
- 👤 Merton A. Look
- 👤 Richard M. Lowe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 11:11
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/06; G03G15/10; G03G15/101
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
109 words
A method for developing electrostatic images on a sheet of electrophotographic copy material comprising the steps of moving the copy material sheet past and separated from a flat perforate development electrode of the type used to eliminate edge effect in a path of uniform distance from the electrode and simultaneously spraying liquid toner against pressure reducing means separate from and disposed adjacent to the electrode to reduce and make uniform the pressure of the flowing liquid toner and flowing the liquid toner uniformly over and through the perforate development electrode and over the image side of the sheet without contacting the side opposite the image side with said toner.
Claim 2
Independent Claim
109 words
A method for developing electrostatic images on a sheet of electrophotographic copy material comprising the steps of moving the copy material sheet past and separated from a flat perforate development electrode of the type used to eliminate edge effect in a path of uniform distance from the electrode and simultaneously spraying liquid toner against pressure reducing means separate from and disposed adjacent to the electrode to reduce and make uniform the pressure of the flowing liquid toner and flowing the liquid toner uniformly over and through the perforate development electrode and over the image side of the sheet without contacting the side opposite the image side with said toner.
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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) | 1985-08-02 | 1986-02-01 | 1986-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-08-02 | 1990-02-01 | 1990-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-08-02 | 1994-02-01 | 1994-08-03 | $7700.00 | Window Closed / Lapsed |