US4357618A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrostatic imaging apparatus
Assignee: ALGOGRAPHIC ASSOC
•
Filing: 1979-12-12
•
Granted: 1982-11-02
•
Expires: 1999-12-12
Abstract
Abstract An electrostatic imaging process uses either a moving belt or a rotating drum with an insulative or dielectric layer backed by a conductive layer. A matrix of writing styli are used to charge the dielectric layer which are ionized air jets. After the image is developed by a toner, the toner is heated so that it will be concurrently transferred and fixed to the paper sheet.
Inventors
- 👤 Evan L. Ragland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:17
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/22; G03G15/32; G03G15/321; G03G15/323; G06; G06K; G06K15/00; G06K15/02; G06K15/14
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
100 words
Electrostatic imaging apparatus comprising: a member having a surface capable of holding an electrostatic image on its surface; means for applying a substantially uniformly distributed electrostatic charge on said surface; and writing means for creating said electrostatic image including means for providing a selective plurality of ionized gas-jets which discharge impinged upon portions of said uniformly distributed charge including a non-conductive plate having a plurality of perforations and in close proximity to said surface and electrical means individually connected to each perforation for gating said perforations open or closed for selecting which of the perforations will provide an ionized gas-jet.
Claim 2
Dependent Claim
100 words
Electrostatic imaging apparatus comprising: a member having a surface capable of holding an electrostatic image on its surface; means for applying a substantially uniformly distributed electrostatic charge on said surface; and writing means for creating said electrostatic image including means for providing a selective plurality of ionized gas-jets which discharge impinged upon portions of said uniformly distributed charge including a non-conductive plate having a plurality of perforations and in close proximity to said surface and electrical means individually connected to each perforation for gating said perforations open or closed for selecting which of the perforations will provide an ionized gas-jet.
Claim 3
Dependent Claim
14 words
Apparatus as in Claim 1 where said perforated non-conductive plate is a semiconductive wafer.
Claim 4
Dependent Claim
16 words
Apparatus as in Claim 1 where said perforated non-conductive plate is a printed circuit type board.
Claim 5
Dependent Claim
27 words
Apparatus as in Claim 1 where said proximity or said plate to said surface is of the same order of magnitude as the diameter of said perforations.
Claim 6
Dependent Claim
32 words
Apparatus as in Claim 1 where said electrical means includes means for applying to a perforation a voltage equivalent to said electrostatic charge on said surface to effectively gate such perforation closed.
Claim 7
Dependent Claim
24 words
Apparatus as in Claim 5 where said electrical means includes means for allowing a perforation to electrically float to effectively gate open such perforation.
Claim 8
Dependent Claim
60 words
Apparatus as in claim 1 where said writing means includes means for producing ions, where said perforations of said non-conductive plate are in proximity to said ion producing means and where said electrical means for gating selects which of the perforations will allow the passage therethrough of said ions from said ion producing means to provide an ionized gas jet.
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) | 1985-11-01 | 1986-05-03 | 1986-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-11-01 | 1990-05-03 | 1990-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-11-01 | 1994-05-03 | 1994-11-02 | $7700.00 | Window Closed / Lapsed |