US4322155A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrostatic display apparatus
Assignee: RAGEN PRECISION IND Inc
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Filing: 1979-12-20
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Granted: 1982-03-30
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Expires: 1999-12-20
Abstract
Abstract An electrostatic display, recall or print apparatus in which a latent electrostatic pattern or image is formed on a dielectric strip; the image is toned (made visible by dusting with an electrostatic powder) and is advanced to a display station where it is viewed; if the image is acceptable, the strip is advanced to a fusing station and made permanent; if the image is not acceptable, the strip is withdrawn, the electrostatic image is neutralized and the toner is removed.
Inventors
- 👤 Ira Lopata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:44
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/22; G03G15/221; G03G2221/00; G03G2221/0005
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
302 words
An apparatus for forming, toning and displaying the unfused visible electrostatic image on an electrostatic strip, and alternatively and selectively for erasing the electrostatic image to permit reuse of the electrostatic strip or for fusing the visible electrostatic image to make a permanent copy thereof includes, a. source means for said electrostatic strip, b. a generally horizontal planar surface means having a viewing station thereon disposed in spaced relation to the source means, said planar surface means having an inlet end and an outlet end for the electrostatic strip, c. means connected to the source means to normally feed the electrostatic strip in a forward direction through a predetermined course to and across the viewing station on said planar surface means to dispose the electrostatic strip for inspection at the viewing station and said feed means including, means for reversing the direction of movement of the electrostatic strip, d. means between the source means and the inlet side of the planar surface means and disposed relative the electrostatic strip to form a latent electrostatic image on the electrostatic strip, e. toning means between the latent electrostatic image forming means and the inlet side of the planar surface means to make the latent electrostatic image visible for inspection when the electrostatic strip is moved forward to the viewing station, f. means adjacent the outlet end of the planar surface selectively operable only on forward movement of the electrostatic strip to fuse the desired visible electrostatic image to form a permanent copy thereof, and g. a normally non-operative means disposed adjacent the inlet end of the planar surface means selectively operable when the reversing means is actuated to move the electrostatic strip in a reverse direction to neutralize and remove toner from the unfused visible electrostatic image to permit reuse of the electrostatic strip.
Claim 2
Independent Claim
302 words
An apparatus for forming, toning and displaying the unfused visible electrostatic image on an electrostatic strip, and alternatively and selectively for erasing the electrostatic image to permit reuse of the electrostatic strip or for fusing the visible electrostatic image to make a permanent copy thereof includes, a. source means for said electrostatic strip, b. a generally horizontal planar surface means having a viewing station thereon disposed in spaced relation to the source means, said planar surface means having an inlet end and an outlet end for the electrostatic strip, c. means connected to the source means to normally feed the electrostatic strip in a forward direction through a predetermined course to and across the viewing station on said planar surface means to dispose the electrostatic strip for inspection at the viewing station and said feed means including, means for reversing the direction of movement of the electrostatic strip, d. means between the source means and the inlet side of the planar surface means and disposed relative the electrostatic strip to form a latent electrostatic image on the electrostatic strip, e. toning means between the latent electrostatic image forming means and the inlet side of the planar surface means to make the latent electrostatic image visible for inspection when the electrostatic strip is moved forward to the viewing station, f. means adjacent the outlet end of the planar surface selectively operable only on forward movement of the electrostatic strip to fuse the desired visible electrostatic image to form a permanent copy thereof, and g. a normally non-operative means disposed adjacent the inlet end of the planar surface means selectively operable when the reversing means is actuated to move the electrostatic strip in a reverse direction to neutralize and remove toner from the unfused visible electrostatic image to permit reuse of the electrostatic strip.
Claim 3
Dependent Claim
58 words
In an apparatus as claimed in claim 1 wherein the means to form the latent electrostatic image on the electrostatic strip includes; a. cathode-ray tube means, b. a plurality of chargeable fibers on the face of the tube charged in accordance with a preselected pattern; and c. said chargeable fibers disposed for charging contact with the electrostatic strip.
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) | 1985-03-29 | 1985-09-28 | 1986-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-03-29 | 1989-09-28 | 1990-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-03-29 | 1993-09-28 | 1994-03-30 | $7700.00 | Window Closed / Lapsed |