US3789223A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Charging method for relatively movable electrophotographic means and corona means
Assignee: Fujifilm Holdings Corp
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Filing: 1971-08-11
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Granted: 1974-01-29
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Expires: 1991-08-11
Abstract
Abstract An electrophotographic coating provided on a highly insulating backing having a conductive interlayer can be uniformly charged in one polarity by forming a conductive path in a certain region of said coating by means of light exposure and on said conductive path applying a corona discharge of the opposite polarity whereby another corona electrode imparts corona ions of the first polarity, in which the coating is to be charged, on an area of the coating which is sufficiently close to the exposed area.
Inventors
- 👤 M Sato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 19:41
CPC Classifications
G; G03; G03G; G03G13/00; G03G13/02; Y; Y10; Y10S; Y10S430/00; Y10S430/001; Y10S430/102
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-01-28 | 1977-07-30 | 1978-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-28 | 1981-07-30 | 1982-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-28 | 1985-07-30 | 1986-01-29 | $7700.00 | Window Closed / Lapsed |