US3882822A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for Developing Electrostatic Latent Images
Assignee: Xerox Corp
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Filing: 1974-01-11
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Granted: 1975-05-13
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Expires: 1994-01-11
Abstract
Abstract Apparatus for the development of electrostatic latent images formed on a support member. Magnetic toner particles are magnetically drawn over a nonmagnetic surface, while on said surface a charge is applied to the toner particles which is opposite in polarity to that of the electrostatic latent image. A stream of gaseous material is directed against the charged toner particles carried on the non-magnetic surface to form a suspension of said particles in said gaseous material. This suspension, or powder cloud, is contacted with said electrostatic latent image to thereby develop said image with said toner particles. Also provided are toner collecting magnetic rollers which act as a seal by removing the residual toner particles from the suspension and thereby prevent the same from contaminating the rest of the machine.
Inventors
- 👤 Jr William A Sullivan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:51
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/06; G03G15/08; G03G15/09; G03G15/0803
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
182 words
An apparatus for developing electrostatic latent images previously formed on a support member comprising: a reservoir for storing a supply of magnetic toner particles a chamber having one end positioned to receive said electrostatic latent image-bearing support member and an opposed end terminated in said reservoir; a drum positioned partially within said reservoir in position to contact the magnetic toner particles therein; means situated within said drum for producing a magnetic field poled to attract magnetic toner particles and rotating in a predetermined direction, whereby toner particles are carried in said direction from said reservoir circumferentially across the surface of said drum; means for imposing a charge upon said magnetic particles of opposite polarity to the electrostatic latent image; and blower means within said chamber for directing a jet of gaseous material across the surface of said drum to dislodge the magnetic particles from the surface thereof, thereby forming a suspension of said magnetic particles in said gaseous material, whereby development of said electrostatic latent image is effected upon contact of said magnetic toner particles in said suspension with said latent image.
Claim 2
Independent Claim
182 words
An apparatus for developing electrostatic latent images previously formed on a support member comprising: a reservoir for storing a supply of magnetic toner particles a chamber having one end positioned to receive said electrostatic latent image-bearing support member and an opposed end terminated in said reservoir; a drum positioned partially within said reservoir in position to contact the magnetic toner particles therein; means situated within said drum for producing a magnetic field poled to attract magnetic toner particles and rotating in a predetermined direction, whereby toner particles are carried in said direction from said reservoir circumferentially across the surface of said drum; means for imposing a charge upon said magnetic particles of opposite polarity to the electrostatic latent image; and blower means within said chamber for directing a jet of gaseous material across the surface of said drum to dislodge the magnetic particles from the surface thereof, thereby forming a suspension of said magnetic particles in said gaseous material, whereby development of said electrostatic latent image is effected upon contact of said magnetic toner particles in said suspension with said latent image.
Claim 3
Dependent Claim
27 words
Apparatus as defined in claim 1 further including means within said chamber proximate the surface of said drum for deflecting said suspension toward said image-bearing support member.
Claim 4
Dependent Claim
42 words
Apparatus as defined in claim 1 wherein said electrostatic latent image-bearing support member enters and exits the chamber at said one end, and further including magnetic seals adjacent the entrance and exit for said support member to prevent leakage of toner particles.
Claim 5
Dependent Claim
15 words
Apparatus as defined in claim 1 wherein the drum comprises a non-magnetic, electrically conductive material.
References Cited (Backward Citations)
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Cited
US3133834A
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US3310205A
Cited
US3645770A
Cited
US3640247A
Cited
US3659311A
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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) | 1978-05-12 | 1978-11-11 | 1979-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-12 | 1982-11-11 | 1983-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-12 | 1986-11-11 | 1987-05-13 | $7700.00 | Window Closed / Lapsed |