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US3663291A Expired / Lapsed US ⏱️ 0.0 years remaining

Cascade development

Assignee: Xerox Corp
•
Filing: 1969-10-14
•
Granted: 1972-05-16
•
Expires: 1989-10-14
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Abstract

Abstract Processes are provided for improving the mixing efficiency of carrier and toner in electrostatographic apparatus by causing a partial reverse cascade of developer from the buckets of a bucket-type conveyor in the electrostatographic developing apparatus prior to said developer cascading across the electrostatographic surface whereby developer falls back upon subadjacent buckets and mixes with toner newly deposited therein. An improvement in electrostatographic development apparatus is obtained by providing the buckets of the bucket-type conveyor of the development apparatus with a plurality of apertures in the posterior wall of each bucket thereby obtaining buckets adapted to allow a partial egress of developer from said apertures prior to said developer cascading across the electrostatographic surface whereby developer falls back upon subadjacent buckets and mixes with fresh toner released from the toner dispenser.

Inventors

  • 👤 Stephen F Royka

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-28 04:21
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/06; G03G15/08; G03G15/0801

Claims Analysis

Total Claims: 3
Claim 1
Independent Claim 26 words
The process as defined in claim 1 wherein developer material in a bucket is cascaded to a subadjacent bucket through a discharge opening in said bucket.
Claim 2
Dependent Claim 44 words
Process as defined in claim 2 wherein a portion of additional toner particles is admixed with a portion of developer contained in said buckets by causing a reverse cascade of developer through a plurality of apertures contained in the posterior walls of said buckets.
Claim 3
Dependent Claim 52 words
Process as defined in claim 2 wherein a portion of additional toner particles is admixed with a portion of developer contained in said buckets by causing a partial reverse cascade of developer from said buckets through a gate in the posterior walls of said buckets, said gate being partially opened by gravity.

References Cited (Backward Citations)

US3303817A Cited
US3301126A Cited
US3472657A Cited
US3347691A Cited
US3512967A Cited
US3506347A Cited
US3416494A Cited
US3430606A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1975-05-16 1975-11-15 1976-05-16 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1979-05-16 1979-11-15 1980-05-16 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1983-05-16 1983-11-15 1984-05-16 $7700.00 Window Closed / Lapsed

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