US3608522A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Xerographic development control apparatus
Assignee: Xerox Corp
•
Filing: 1969-06-04
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Granted: 1971-09-28
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Expires: 1989-06-04
Abstract
Abstract Apparatus for controlling the introduction of magnetizable developer material to a plurality of magnetic developing rollers for effecting the development of latent electrical charges selectively retained on a support surface in image configuration. The developing apparatus is continually operable with image development being effected by gating developer material to the magnetic developing rollers or recirculating the developer material in the developer apparatus removed from the effective magnetic field of the developing rollers.
Inventors
- 👤 James R Davidson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:41
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/06; G03G15/08; G03G15/09
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
29 words
The apparatus of claim 1 wherein said magnetic field-emitting-conveying means positioned adjacent a magnetic-field-emitting developing unit includes a pickoff roller comprising a nonmagnetic cylinder rotatably supported about a magnet.
Claim 2
Dependent Claim
69 words
The apparatus of claim 2 wherein said gating means positioned between said conveying means and the developing unit comprises a baffle plate pivotally supported between said pickoff roller and said magnet-field-emitting developing unit actuable into and out from contact with said pickoff roller to control the conveying of developer material to the support surface in response to the pivoting of said baffle plate into contact with said pickoff roller.
Claim 3
Dependent Claim
20 words
The apparatus of claim 3 wherein said baffle plate is pivotally actuable in response to the energization of a solenoid.
Claim 4
Dependent Claim
15 words
The apparatus of claim 3 wherein said baffle plate is formed from a nonmagnetic material.
References Cited (Backward Citations)
US2745549A
Cited
US3113042A
Cited
US3081737A
Cited
US3238920A
Cited
US3367306A
Cited
US3327852A
Cited
US3472205A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-27 | 1975-03-29 | 1975-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-27 | 1979-03-29 | 1979-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-27 | 1983-03-29 | 1983-09-28 | $7700.00 | Window Closed / Lapsed |