US3788844A
Expired / Lapsed
US
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Charging method for electrophotography
Assignee: Fujifilm Holdings Corp
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Filing: 1971-10-05
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Granted: 1974-01-29
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Expires: 1991-10-05
Abstract
Abstract AN ELECTROPHOTOGRAPHIC METHOD FOR CHARGING THE SURFACE OF AN ELONGATED ELECTROPHOTOGRAPHIC MEMBER WOUND UPON AT ONE ROLL, THE MEMBER INCLUDING A PHOTOCONDUCTIVE INSULATING LAYER DISPOSED ON AN UNGROUNDED CONDUTIVE SUBSTRATE INTERPOSED BETWEEN THE PHOTOCONDUCTIVE INSULATING LAYER AND AN ELECTRICALLY INSULATING SUBSTRATE BY SIMULTANEOUSLY RESPECTIVELY APPLYING HIGH CHARGING VOLTAGES OF OPPOSITE POLARITIES TO A MAIN CORONA DISCHARGE ELECTRODE DISPOSED ADJACENT TO THE UPPER SURFACE OF THE ELONGATED MEMBER AND A SUB-DISCHARGE CORONA DISCHARGE ELECTRODE DISPOSED ADJACENT THE SIDE OF THE ROLL.
Inventors
- 👤 M Sato
- 👤 I Takahashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 13:14
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/02; G03G15/0291; Y; Y10; Y10S; Y10S430/00; Y10S430/001; Y10S430/102
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
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 |