Title: Triboelectric filter and method of using it in an electrophotographic printer

Abstract: Airborne electrophotographic toner particles are filtered by a body of carrier beads of a material selected to develop a relatively high triboelectric charge upon contact by the toner particles. When the filtering capability of the body of carrier beads is exhausted, the carrier beads and the collected toner are simply mixed into the developer mix of a xerographic machine whereby the collected toner can be reused.

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Inventors: Simpson, Henry Wellington (Lexington, KY, US)

Application Number: 554888
Filing Date: 1975-03-03
Publication_date: 1976-09-21
Assignee: International Business Machines Corporation (Armonk, NY)
Primary Class(es): 430/121 96/17, 134/6, 399/343, 399/358, 427/345, 430/111.41
Other Classes:
US Patent Ref:

2844214	Jul, 1958	Hall et al.	55/103.
2992700	Jul, 1961	Silverman et al.	55/103.
3424615	Jan, 1969	Eichorn et al.	134/7.
3654901	Apr, 1972	Donohue et al.	118/637.
3680287	Aug, 1972	Wood et al.	55/524.
3780391	Dec, 1973	Leenhouts	355/15.
3816157	Jun, 1974	Donohue et al.	355/15.
3850521	Nov, 1974	Saupe	355/15.

Other Refs:
Primary Examiner: Smith, Ronald H.
Assistant Examiner: Frenkel, Stuart D.
Attorney: Girvin, Jr.; John W.