US4299901A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of development
Assignee: Xerox Corp
•
Filing: 1980-04-21
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Granted: 1981-11-10
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Expires: 2000-04-21
Abstract
Abstract An apparatus which develops a latent image by advancing a conductive developer composition comprising marking particles into contact therewith. The apparatus interacts with the developer composition causing the developer composition to have higher and lower regions of conductivity. In the regions of higher conductivity, development of the solid areas within the latent image is optimized. Development of lines within the latent image is optimized in the regions of lower conductivity.
Inventors
- 👤 Raymond W. Huggins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 10:00
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/06; G03G15/08; G03G15/09
Claims Analysis
Total Claims: 38
Claim 1
Independent Claim
133 words
A method of developing a latent image with a conductive developer composition comprising marking particles, including the steps of: contacting the latent image with the developer composition in at least a first region and a second region, with the first region being spaced from the second region, to deposit marking particles onto the latent image, thereby developing the latent image; and controlling the development process to cause the developer composition to have a first conductivity in the first region to optimize development of the solid areas within the latent image with the marking particles, and to cause the developer composition to have a second conductivity in the second region with the second conductivity being lower than the first conductivity to optimize development of the lines within the latent image with the marking particles.
Claim 2
Independent Claim
133 words
A method of developing a latent image with a conductive developer composition comprising marking particles, including the steps of: contacting the latent image with the developer composition in at least a first region and a second region, with the first region being spaced from the second region, to deposit marking particles onto the latent image, thereby developing the latent image; and controlling the development process to cause the developer composition to have a first conductivity in the first region to optimize development of the solid areas within the latent image with the marking particles, and to cause the developer composition to have a second conductivity in the second region with the second conductivity being lower than the first conductivity to optimize development of the lines within the latent image with the marking particles.
Claim 3
Dependent Claim
46 words
A method as recited in claim 1, wherein said step of controlling includes the steps of: forming a magnetic field in the first region; and generating an electrical field in the first region with the magnetic field vector being substantially parallel to the electrical field vector.
Claim 4
Dependent Claim
36 words
A method as recited in claim 2, wherein said step of forming includes the step of orienting a magnetic member so as to position a magnetic pole opposed to the latent image in the first region.
Claim 5
Dependent Claim
37 words
A method as recited in claim 3, wherein said step of controlling includes the step of orienting a magnetic member so as to position a weak magnetic pole opposed to the latent image in the second region.
Claim 6
Dependent Claim
56 words
A method as recited in claim 4, wherein said step of controlling includes the step of positioning the magnetic member in the first region a first distance from the latent image and the magnetic member in the second region a second distance from the latent image with the first distance being less than the second distance.
Claim 7
Dependent Claim
51 words
A method as recited in claim 2, wherein said step of controlling includes the steps of: orienting a magnetic member so as to position a magnetic pole opposed to the latent image in the second region; and generating a weaker magnetic field in the second region than in the first region.
Claim 8
Dependent Claim
56 words
A method as recited in claim 6, wherein said step of controlling includes the step of positioning the magnetic member in the first region a first distance from the latent image and the magnetic member in the second region a second distance from the latent image with the first distance being less than the second distance.
Claim 9
Dependent Claim
109 words
A method as recited in claim 1, wherein said step of contacting includes the steps of: attracting the developer composition to a first member positioned in the first region and spaced a first distance from the latent image; moving the first member to advance the developer composition into contact with the latent image in the first region; attracting the developer composition to a second member positioned in the second region and spaced a second distance from the latent image with the first distance being less than the second distance; and moving the second member to advance the developer composition into contact with the latent image in the second region.
Claim 10
Independent Claim
171 words
A method of developing a latent image with a conductive developer composition comprising marking particles, including the steps of: contacting the latent image with the developer composition in at least a first region and a second region, with the first region being spaced from the second region, to deposit marking particles onto the latent image, thereby developing the latent image; and controlling the development process to cause the developer composition to have a first conductivity in the first region to optimize development of the solid areas within the latent image with the marking particles, and to cause the developer composition to have a second conductivity in the second region with the second conductivity being lower than the first conductivity to optimize development of the lines within the latent image with the marking particles, said step of controlling comprising the steps of forming a magnetic field in the first region, and generating an electrical field in the first region with the magnetic field vector being substantially normal to the electrical field vector.
Claim 11
Independent Claim
171 words
A method of developing a latent image with a conductive developer composition comprising marking particles, including the steps of: contacting the latent image with the developer composition in at least a first region and a second region, with the first region being spaced from the second region, to deposit marking particles onto the latent image, thereby developing the latent image; and controlling the development process to cause the developer composition to have a first conductivity in the first region to optimize development of the solid areas within the latent image with the marking particles, and to cause the developer composition to have a second conductivity in the second region with the second conductivity being lower than the first conductivity to optimize development of the lines within the latent image with the marking particles, said step of controlling comprising the steps of forming a magnetic field in the first region, and generating an electrical field in the first region with the magnetic field vector being substantially normal to the electrical field vector.
Claim 12
Dependent Claim
40 words
A method as recited in claim 9, wherein said step of forming includes the step of orienting a magnetic member so as to position remotely the magnetic poles from the region opposed to the latent image in the first region.
Claim 13
Dependent Claim
46 words
A method as recited in claim 10, wherein said step of controlling includes the steps of: forming a magnetic field in the second region; and generating an electrical field in the second region with the magnetic field vector being substantially parallel to the electrical field vector.
Claim 14
Dependent Claim
36 words
A method as recited in claim 11, wherein said step of forming includes the step of orienting a magnetic member so as to position a magnetic pole opposed to the latent image in the second region.
Claim 15
Dependent Claim
56 words
A method as recited in claim 12, wherein said step of controlling includes the step of positioning the magnetic member in the first region a first distance from the latent image and the magnetic member in the second region a second distance from the latent image with the first distance being less than the second distance.
Claim 16
Dependent Claim
35 words
A method as recited in claim 10, wherein said step of forming includes the step of orienting a magnetic member to position a weak magnetic pole opposed to the latent image in the second region.
Claim 17
Dependent Claim
56 words
A method as recited in claim 14, wherein said step of controlling includes the step of positioning the magnetic member in the first region a first distance from the latent image and the magnetic member in the second region a second distance from the latent image with the first distance being less than the second distance.
Claim 18
Dependent Claim
55 words
A method as recited in claim 10, wherein said step of controlling includes the steps of: orienting a magnetic member so as to position remotely the magnetic poles from the region opposed to the latent image in the second region; and generating a weaker magnetic field in the second region than in the first region.
Claim 19
Dependent Claim
56 words
A method as recited in claim 16, wherein said step of controlling includes the step of positioning the magnetic member in the first region a first distance from the latent image and the magnetic member in the second region a second distance from the latent image with the first distance being less than the second distance.
Claim 20
Independent Claim
146 words
A method of electrophotographing printing, including the steps of: recording an electrostatic latent image on a photoconductive surface; contacting the electrostatic latent image with a conductive developer composition comprising carrier granules having toner particles adhering thereto triboelectrically in at least a first region and a second region, with the first region being spaced from the second region, to deposit toner particles onto the electrostatic latent image, thereby developing the electrostatic latent image; and controlling the development process to cause the developer composition to have a first conductivity in the first region to optimize development of the solid areas within the electrostatic latent image with the toner particles, and to cause the developer composition to have a second conductivity in the second region with the second conductivity being lower than the first conductivity to optimize development of the lines within the latent image with the toner particles.
Claim 21
Independent Claim
146 words
A method of electrophotographing printing, including the steps of: recording an electrostatic latent image on a photoconductive surface; contacting the electrostatic latent image with a conductive developer composition comprising carrier granules having toner particles adhering thereto triboelectrically in at least a first region and a second region, with the first region being spaced from the second region, to deposit toner particles onto the electrostatic latent image, thereby developing the electrostatic latent image; and controlling the development process to cause the developer composition to have a first conductivity in the first region to optimize development of the solid areas within the electrostatic latent image with the toner particles, and to cause the developer composition to have a second conductivity in the second region with the second conductivity being lower than the first conductivity to optimize development of the lines within the latent image with the toner particles.
Claim 22
Dependent Claim
48 words
A method of printing as recited in claim 18, wherein said step of controlling includes the steps of: forming a magnetic field in the first region; and generating an electrical field in the first region with the magnetic field vector being substantially parallel to the electrical field vector.
Claim 23
Dependent Claim
38 words
A method of printing as recited in claim 19, wherein said step of forming includes the step of orienting a magnetic member so as to position a magnetic pole opposed to the photoconductive surface in the first region.
Claim 24
Dependent Claim
39 words
A method of printing as recited in claim 20, wherein said step of controlling includes the step of orienting a magnetic member so as to position a weak magnetic pole opposed to the photoconductive surface in the second region.
Claim 25
Dependent Claim
58 words
A method of printing as recited in claim 21, wherein said step of controlling includes the step of positioning the magnetic member in the first region a first distance from the photoconductive surface and the magnetic member in the second region a second distance from the photoconductive surface with the first distance being less than the second distance.
Claim 26
Dependent Claim
53 words
A method of printing as recited in claim 19, wherein the step of controlling includes the steps of: orienting a magnetic member so as to position a magnetic pole opposed to the photoconductive surface in the second region; and generating a weaker magnetic field in the second region than in the first region.
Claim 27
Dependent Claim
58 words
A method of printing as recited in claim 23, wherein said step of controlling includes the step of positioning the magnetic member in the first region a first distance from the photoconductive surface and the magnetic member in the second region a second distance from the photoconductive surface with the first distance being less than the second distance.
Claim 28
Dependent Claim
113 words
A method of printing as recited in claim 18, wherein said step of contacting includes the steps of: attracting the developer composition to a first member positioned in the first region and spaced a first distance from the photoconductive surface; moving the first member to advance the developer composition into contact with the electrostatic latent image in the first region; attracting the developer composition to a second member positioned in the second region and spaced a second distance from the photoconductive surface with the first distance being less than the second distance; and moving the second member to advance the developer composition into contact with the electrostatic latent image in the second region.
Claim 29
Independent Claim
184 words
A method of electrophotographing printing, including the steps of: recording an electrostatic latent image on a photoconductive surface; contacting the electrostatic latent image with a conductive developer composition comprising carrier granules having toner particles adhering thereto triboelectrically in at least a first region and a second region, with the first region being spaced from the second region, to deposit toner particles onto the electrostatic latent image, thereby developing the electrostatic latent image; and controlling the development process to cause the developer composition to have a first conductivity in the first region to optimize development of the solid areas within the electrostatic latent image with the toner particles, and to cause the developer composition to have a second conductivity in the second region with the second conductivity being lower than the first conductivity to optimize development of the lines within the latent image with the toner particles, said step of controlling comprising the steps of forming a magnetic field in the first region, and generating an electrical field in the first region with the magnetic field vector being substantially normal to the electrical field vector.
Claim 30
Independent Claim
184 words
A method of electrophotographing printing, including the steps of: recording an electrostatic latent image on a photoconductive surface; contacting the electrostatic latent image with a conductive developer composition comprising carrier granules having toner particles adhering thereto triboelectrically in at least a first region and a second region, with the first region being spaced from the second region, to deposit toner particles onto the electrostatic latent image, thereby developing the electrostatic latent image; and controlling the development process to cause the developer composition to have a first conductivity in the first region to optimize development of the solid areas within the electrostatic latent image with the toner particles, and to cause the developer composition to have a second conductivity in the second region with the second conductivity being lower than the first conductivity to optimize development of the lines within the latent image with the toner particles, said step of controlling comprising the steps of forming a magnetic field in the first region, and generating an electrical field in the first region with the magnetic field vector being substantially normal to the electrical field vector.
Claim 31
Dependent Claim
43 words
A method of printing as recited in claim 26, wherein said step of forming includes the step of orienting a magnetic member so as to position remotely the magnetic poles from the region opposed to the electrostatic latent image in the first region.
Claim 32
Dependent Claim
48 words
A method of printing as recited in claim 27, wherein said step of controlling includes the steps of: forming a magnetic field in the second region; and generating an electrical field in the second region with the magnetic field vector being substantially parallel to the electrical field vector.
Claim 33
Dependent Claim
39 words
A method of printing as recited in claim 28, wherein said step of forming includes the step of orienting a magnetic member so as to position a magnetic pole opposed to the electrostatic latent image in the second region.
Claim 34
Dependent Claim
58 words
A method of printing as recited in claim 29, wherein said step of controlling includes the step of positioning the magnetic member in the first region a first distance from the photoconductive surface and the magnetic member in the second region a second distance from the photoconductive surface with the first distance being less than the second distance.
Claim 35
Dependent Claim
37 words
A method of printing as recited in claim 27, wherein said step of forming includes the step of orienting a magnetic member to position a weak magnetic pole opposed to the photoconductive surface in the second region.
Claim 36
Dependent Claim
58 words
A method of printing as recited in claim 31, wherein said step of controlling includes the step of positioning the magnetic member in the first region a first distance from the photoconductive surface and the magnetic member in the second region a second distance from the latent image with the first distance being less than the second distance.
Claim 37
Dependent Claim
57 words
A method of printing as recited in claim 27, wherein said step of controlling includes the steps of: orienting a magnetic member so as to position remotely the magnetic poles from the region opposed to the photoconductive surface in the second region; and generating a weaker magnetic field in the second region than in the first region.
Claim 38
Dependent Claim
58 words
A method of printing as recited in claim 33, wherein said step of controlling includes the step of positioning the magnetic member in the first region a first distance from the photoconductive surface and the magnetic member in the second region a second distance from the latent image with the first distance being less than the second distance.
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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) | 1984-11-09 | 1985-05-11 | 1985-11-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-11-09 | 1989-05-11 | 1989-11-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-11-09 | 1993-05-11 | 1993-11-10 | $7700.00 | Window Closed / Lapsed |