Patent US3701996A successfully refreshed from Google Patents.
US3701996A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transfer electrostatic printing system
Assignee: RTX Corp
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Filing: 1970-12-02
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Granted: 1972-10-31
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Expires: 1990-12-02
Abstract
Abstract This printing system utilizes an electrostatic drum to selectively receive charges from a row of corona styli, the charges attracting dry toner particles so as to form a selective row of dots, a plurality of dot rows capable of presenting an image of language text or a plot of graphical information. The toner is embedded in the image receiving paper as the paper passes between the electrostatic image drum and a cooperating pressure drum. Auxiliary transfer processes, heat or moisture and charge/selective erase processes are all eliminated.
Inventors
- 👤 Richmond Perley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 06:51
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/22; G03G15/32; G03G15/321; G03G15/24; Y; Y10; Y10S; Y10S101/00; Y10S101/37
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
164 words
A transfer electrostatic printing apparatus comprising: an electrostatic image drum having a relatively hard dielectric surface layer disposed over an electrically conductive surface, and adapted for rotation in a given direction; a plurality of corona styli of the type that induces a corona discharge, and styli disposed adjacent the surface of said drum; means disposed adjacent the periphery of said drum in the direction of rotation from said styli for depositing toner particles on discrete areas of said drum charged by said styli; a source of image receiving medium; a pressure drum disposed adjacent the periphery of said image drum in the direction of rotation from said toner means, said pressure drum and said image drum cooperating to roll said image receiving medium therebetween as said drums rotate, said pressure drum adapted to apply a substantial pressure to said image receiving medium against said image drum, whereby a pattern of toner on said image drum is simultaneously transferred and pressure-fused into said image medium.
Claim 2
Dependent Claim
164 words
A transfer electrostatic printing apparatus comprising: an electrostatic image drum having a relatively hard dielectric surface layer disposed over an electrically conductive surface, and adapted for rotation in a given direction; a plurality of corona styli of the type that induces a corona discharge, and styli disposed adjacent the surface of said drum; means disposed adjacent the periphery of said drum in the direction of rotation from said styli for depositing toner particles on discrete areas of said drum charged by said styli; a source of image receiving medium; a pressure drum disposed adjacent the periphery of said image drum in the direction of rotation from said toner means, said pressure drum and said image drum cooperating to roll said image receiving medium therebetween as said drums rotate, said pressure drum adapted to apply a substantial pressure to said image receiving medium against said image drum, whereby a pattern of toner on said image drum is simultaneously transferred and pressure-fused into said image medium.
Claim 3
Dependent Claim
12 words
The printing apparatus according to claim 1 wherein said layer comprises ceramic.
Claim 4
Dependent Claim
19 words
The printing apparatus according to claim 1 wherein said layer is on the order of a few mils thick.
Claim 5
Dependent Claim
36 words
The printing apparatus according to claim 1 wherein said pressure drum is adapted to apply a pressure on the order of 300 pounds per lineal inch to said image receiving medium against said electrostatic image drum.
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) | 1975-10-31 | 1976-05-01 | 1976-10-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-31 | 1980-05-01 | 1980-10-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-31 | 1984-05-01 | 1984-10-31 | $7700.00 | Window Closed / Lapsed |