Patent US3784397A successfully refreshed from Google Patents.
US3784397A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Imaging system
Assignee: Xerox Corp
•
Filing: 1971-01-29
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Granted: 1974-01-08
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Expires: 1991-01-29
Abstract
Abstract Method for forming images by providing an electrostatographic imaging member bearing an electrostatic latent image on a recording surface, positioning the recording surface spaced from and facing a development electrode, contacting the recording surface with toner particles whereby at least a portion of the toner particles deposit on the recording surface to form at least a partially imaged recording surface, and maintaining the field strength of the development electrode weak during the initial period of development and then increasing the field strength of the development electrode during the latter period of development to form a substantially uniform developed image substantially free of streak, halo, edge effect, and background deposits.
Inventors
- 👤 M Sato
- 👤 O Fukushima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:38
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/06; G03G15/10
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
25 words
A method according to claim 1 including maintaining said electric field strength in said image-free regions insufficient for attracting toner particles to said image-free regions.
Claim 2
Dependent Claim
17 words
A method according to claim 1 wherein said toner particles are suspended in an insulating carrier liquid.
Claim 3
Dependent Claim
16 words
A method according to claim 1 wherein said development electrode comprises a plurality of development electrodes.
Claim 4
Dependent Claim
31 words
A method according to claim 4 including positioning said recording surface spaced from and facing said plurality of development electrodes at sequentially decreasing perpendicular distances from said plurality of development electrodes.
Claim 5
Dependent Claim
12 words
A method according to claim 5 including intermittently advancing said recording surface.
Claim 6
Dependent Claim
50 words
A method according to claim 4 including positioning said plurality of development electrodes at sequentially decreasing perpendicular distances from said recording surface wherein the edge of the first development electrode adjacent the next electrode is positioned closer to said recording surface than the confronting edge of said next development electrode.
Claim 7
Dependent Claim
30 words
A method according to claim 4 including positioning at least one of said plurality of development electrodes at a greater distance from said recording surface than a preceding development electrode.
Claim 8
Dependent Claim
28 words
A method according to claim 1 including positioning said recording surface spaced from and facing said development electrode at substantially continuously decreasing linear distances from said development electrode.
Claim 9
Dependent Claim
57 words
A method according to claim 1 wherein said recording surface is spaced from and facing said development electrode at a distance of about 10 millimeters upon initial contact of said recording surface with said toner particles and at a distance of about 0.2 millimeter prior to termination of contact of said recording surface with said toner particles.
Claim 10
Dependent Claim
63 words
A method according to claim 1 wherein said recording surface is spaced from and facing said development electrode at progressively diminishing distances while said charge density of said electrostatic latent image in said image regions having said peak electric field strength is being reduced to a level below said electrostatic charge density in said regions within said image regions remote from said boundary.
Claim 11
Dependent Claim
22 words
A method according to claim 1 including moving at least a portion of said toner particles through openings in said development electrode.
Claim 12
Dependent Claim
40 words
A method according to claim 1 including transporting along an arcuate path said recording surface spaced from and facing said development electrode wherein said developmeNt electrode comprises an arcuate development electrode positioned at decreasing radial distances from said arcuate path.
Claim 13
Dependent Claim
40 words
A method according to claim 13 wherein said arcuate path comprises a plurality of arcuate paths and said arcuate development electrode comprises a plurality of arcuate development electrodes successively positioned at decreasing radial distances from said plurality of arcuate paths.
Claim 14
Dependent Claim
26 words
A method according to claim 1 wherein said development electrode comprises a plurality of cylindrical development electrodes positioned at successively diminishing distances from said recording surface.
Claim 15
Dependent Claim
58 words
A method according to claim 1 including positioning said recording surface spaced from and facing said development electrode at substantially continuously decreasing linear distances from said recording surface for the initial period of development and positioning said recording surface spaced from and facing said development electrode at a constant distance from said recording surface until development is terminated.
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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) | 1977-01-07 | 1977-07-09 | 1978-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-07 | 1981-07-09 | 1982-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-07 | 1985-07-09 | 1986-01-08 | $7700.00 | Window Closed / Lapsed |