US3669072A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Developer apparatus
Assignee: Xerox Corp
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Filing: 1970-02-11
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Granted: 1972-06-13
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Expires: 1990-02-11
Abstract
Abstract An apparatus for developing electrostatic images wherein a drum or belt encircling a magnetic member has developer particles magnetically attracted to its surface in a serrated surface pattern by means of a brush shaper. A motor rotates the drum or belt carrying the shaped developer particles and deposits them on the charged surface for development. The motor in a reverse rotation phase mixes the developer particles in its container, preventing particle agglomeration.
Inventors
- 👤 Robert W Reynolds
- 👤 James K Bibeau
- 👤 Francis J Jansen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 07:24
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/06; G03G15/08; G03G15/09
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
15 words
The apparatus of claim 1 including a drum adapted to rotate about said magnetic means.
Claim 2
Dependent Claim
15 words
The apparatus of claim 1 including a belt adapted to rotate about said magnetic means.
Claim 3
Dependent Claim
16 words
The apparatus of claim 1 in which said magnetic means comprises a plurality of spaced magnets.
Claim 4
Dependent Claim
13 words
The apparatus of claim 1 in which said magnetic means is fixedly mounted.
Claim 5
Dependent Claim
17 words
The apparatus of claim 1 in which said enlarging means includes shaping means having a serrated edge.
Claim 6
Dependent Claim
128 words
Apparatus for transferring electroscopic developer particles to a charged surface for the development of an electrostatic latent image thereon comprising: a reservoir adapted to hold a quantity of developer material of magnetizable carrier particles mixed with the electroscopic developer particles; a magnetic member positioned on a support means adjacent said developer material for attracting said developer material; means encircling and adapted to rotate about said magnetic member, means positioned adjacent the surface of said encircling means for controlling the amount of the developer material attracted by said magnetic member and serrating the surface area formed by said developer particles to enlarge the surface area thereof; and means for driving said encircling means with respect to said magnetic member whereby said marking particles are deposited on said charged surface.
Claim 7
Dependent Claim
25 words
The apparatus of claim 7 including Means for reversing the direction of rotation of said driving means for mixing said developer materials in said reservoir.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-13 | 1975-12-13 | 1976-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-13 | 1979-12-13 | 1980-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-13 | 1983-12-13 | 1984-06-13 | $7700.00 | Window Closed / Lapsed |