Patent US3018939A successfully refreshed from Google Patents.
Patent US3967892A successfully refreshed from Google Patents.
US3967892A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Development system
Assignee: Xerox Corp
•
Filing: 1974-07-26
•
Granted: 1976-07-06
•
Expires: 1994-07-26
Abstract
Abstract An apparatus in which an electrostatic latent image is developed with electrostatically charged particles. A brush-like array of charged particles is positioned closely adjacent to the electrostatic latent image. A portion of the charged particles are separated from the brush-like array thereof. The separated charged particles are moved into contact with the latent image to render it visible. The foregoing abstract is neither intended to define the invention disclosed in the specification, nor is it intended to be limiting as to the scope of the invention in any way.
Inventors
- 👤 Charles A. Whited
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:35
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/06; G03G15/08; G03G15/09; G03G15/0803; G03G2215/00; G03G2215/06; G03G2215/0634; G03G2215/0636; G03G2215/0643
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
95 words
An apparatus for developing an electrostatic latent image with electrostatically charged particles, including: magnetic field producing means operatively positioned closely adjacent to the latent image for generating a brush-like array of charged particles; development electrode means associated with said magnetic field producing means; means for separating a portion of the charged particles from the brush-like array thereof including a plurality of closely spaced vanes arranged to contact the brush-like array of charged particles; and means for moving the separated charged particles into contact with the latent image so as to render the latent image visible.
Claim 2
Independent Claim
95 words
An apparatus for developing an electrostatic latent image with electrostatically charged particles, including: magnetic field producing means operatively positioned closely adjacent to the latent image for generating a brush-like array of charged particles; development electrode means associated with said magnetic field producing means; means for separating a portion of the charged particles from the brush-like array thereof including a plurality of closely spaced vanes arranged to contact the brush-like array of charged particles; and means for moving the separated charged particles into contact with the latent image so as to render the latent image visible.
Claim 3
Dependent Claim
30 words
An apparatus as recited in claim 1, wherein said moving means includes a blower arranged to generate an air flow which moves the separate charged particles toward the latent image.
Claim 4
Dependent Claim
49 words
An apparatus as recited in claim 2, wherein said magnetic field producing means includes: a tubular member of non-magnetic material journaled for rotary movement; and a magnetic member fixedly disposed within said tubular member for creating a magnetic field in the path of the periphery of said tubular member.
Claim 5
Dependent Claim
24 words
An apparatus as recited in claim 3, wherein said development electrode includes at least one conductive plate closely spaced to the electrostatic latent image.
Claim 6
Dependent Claim
17 words
An apparatus as recited in claim 4, further including means for electrically biasing said plurality of vanes.
Claim 7
Dependent Claim
16 words
An apparatus as recited in claim 5, further including means for electrically biasing said conductive plate.
Claim 8
Dependent Claim
18 words
An apparatus as recited in claim 6, further including means for electrically biasing said magnetic field producing means.
Claim 9
Dependent Claim
153 words
An electrophotographic printing machine of the type having a photoconductive member, means for charging the photoconductive member to a substantially uniform charge potential, and an exposure mechanism for projecting a light image corresponding to the original document being reproduced onto the charged photoconductive member to record thereon an electrostatic latent image thereof, wherein the improvement includes: magnetic field producing means operatively positioned closely adjacent to the electrostatic latent image recorded on the photoconductive member for forming a brush-like array of developer mix comprising carrier granules and toner particles; development electrode means associated with said magnetic field producing means; means for separating a portion of the toner particles from the developer mix including a plurality of closely spaced vanes arranged to contact the brush-like array of developer mix; and means for moving the separated toner particles into contact with the electrostatic latent image recorded on the photoconductive member producing a toner powder image thereon.
Claim 10
Dependent Claim
153 words
An electrophotographic printing machine of the type having a photoconductive member, means for charging the photoconductive member to a substantially uniform charge potential, and an exposure mechanism for projecting a light image corresponding to the original document being reproduced onto the charged photoconductive member to record thereon an electrostatic latent image thereof, wherein the improvement includes: magnetic field producing means operatively positioned closely adjacent to the electrostatic latent image recorded on the photoconductive member for forming a brush-like array of developer mix comprising carrier granules and toner particles; development electrode means associated with said magnetic field producing means; means for separating a portion of the toner particles from the developer mix including a plurality of closely spaced vanes arranged to contact the brush-like array of developer mix; and means for moving the separated toner particles into contact with the electrostatic latent image recorded on the photoconductive member producing a toner powder image thereon.
Claim 11
Dependent Claim
36 words
A printing machine as recited in claim 8, wherein said moving means includes a blower arranged to generate an air flow which moves the separated toner particles toward the latent image recorded on the photoconductive member.
Claim 12
Dependent Claim
50 words
A printing machine as recited in claim 9, wherein said magnetic field producing means includes: a tubular member of non-magnetic material journaled for rotary movement; and a magnetic member fixedly disposed within said tubular member for creating a magnetic field in the path of the periphery of said tubular member.
Claim 13
Dependent Claim
30 words
A printing machine as recited in claim 10, wherein said development electrode includes at least one conductive plate closely spaced to the electrostatic latent image recorded on the photoconductive member.
Claim 14
Dependent Claim
18 words
A printing machine as recited in claim 11, further including means for electrically biasing said plurality of vanes.
Claim 15
Dependent Claim
17 words
A printing machine as recited in claim 12, further including means for electrically biasing said conductive plate.
Claim 16
Dependent Claim
19 words
A printing machine as recited in claim 13, further including means for electrically biasing said magnetic field producing means.
References Cited (Backward Citations)
US2732775A
Cited
US3572288A
Cited
US3685485A
Cited
US3636924A
Cited
US3791730A
Cited
US3754531A
Cited
US3754526A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-07-06 | 1980-01-05 | 1980-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-07-06 | 1984-01-05 | 1984-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-07-06 | 1988-01-05 | 1988-07-06 | $7700.00 | Window Closed / Lapsed |