Patent US3689144A successfully refreshed from Google Patents.
US3689144A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrostatic copying apparatus employing development on side of the imaging sheet opposite the photoconductive coating
Assignee: Individual
•
Filing: 1971-01-28
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Granted: 1972-09-05
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Expires: 1991-01-28
Abstract
Abstract Apparatus for electrostatic reproduction of indicia, wherein a sheet of record material having an insulating substrate and a coating of photoconductive material on one side thereof is electrically charged, the photoconductive side is then exposed to light coming from the indicia to form a latent image, an electrical connection is established between the exposed photoconductive coating and a body of electrostatically attractable toner, the toner is applied to the substrate on the side opposite the photoconductive coating to render the latent image visible.
Inventors
- 👤 Arthur L Kaufman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 13:12
CPC Classifications
G; G03; G03G; G03G13/00; G03G13/22
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
46 words
Apparatus according to claim 1, wherein said means for electrically connecting the exposed face of said sheet of record medium with said toner in contact with the opposite face of said sheet comprises a metallic contact member in contact with said exposed face of said sheet.
Claim 2
Dependent Claim
67 words
Apparatus according to claim 1, wherein said means for electrically connecting said exposed face of said sheet to said toner in contact with the opposite face thereof comprises a mass of magnetic, conductive particles adhering to a magnet, said particles being in contact with the exposed face of said sheet, said magnet being electrically connected to said toner in contact with the opposite face of said sheet.
Claim 3
Dependent Claim
63 words
Apparatus according to claim 1, wherein said means for electrically connecting said face of said sheet to the rear thereof comprises a conductive corona of ionized gas molecules, said corona being in conductive contact with an original sheet in facing relation to said sheet of record medium and connected by a conductive path with toner in contact with the rear of said sheet.
Claim 4
Dependent Claim
31 words
Apparatus according to claim 1, wherein said means for electrically connecting said face of said sheet to the rear thereof comprises means for immersing said sheet in a mass of toner.
Claim 5
Dependent Claim
13 words
Apparatus according to claim 1 in which the sheet comprises a photoconductive medium.
References Cited (Backward Citations)
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US2976144A
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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) | 1975-09-05 | 1976-03-06 | 1976-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-05 | 1980-03-06 | 1980-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-05 | 1984-03-06 | 1984-09-05 | $7700.00 | Window Closed / Lapsed |