US3779749A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of charging in electrophotography
Assignee: Fujifilm Holdings Corp
•
Filing: 1971-09-10
•
Granted: 1973-12-18
•
Expires: 1991-09-10
Abstract
Abstract An electrophotographic material comprising a photoconductive isolating layer on an electrically conductive layer is charged without the need for grounding the sheet by simultaneously applying to the photoconductive side of the sheet a corona discharge of one polarity before the developing station and a corona discharge of the opposite polarity after the developing station.
Inventors
- 👤 M Sato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:37
CPC Classifications
G; G03; G03G; G03G13/00; G03G13/22; G03G13/02; Y; Y10; Y10S; Y10S430/00; Y10S430/001; Y10S430/102
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
21 words
The method of claim 1 wherein the corona discharge before developing is positive and the corona discharge after developing is negative.
Claim 2
Dependent Claim
21 words
The method of claim 1 wherein the corona discharge before developing is negative and the corona discharge after developing is positive.
References Cited (Backward Citations)
US2965481A
Cited
US3041167A
Cited
US3412242A
Cited
US3519420A
Cited
US3444369A
Cited
US3675011A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-17 | 1977-06-18 | 1977-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-17 | 1981-06-18 | 1981-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-17 | 1985-06-18 | 1985-12-18 | $7700.00 | Window Closed / Lapsed |