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Primary Examiner: Tokar, Michael J.
Assistant Examiner:
Attorney: Alberding; Gilbert E.

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Title: Static electricity indicator



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Claims: We claim:

1. An electrostatic indicator for detecting a region of electrostatic density comprising free-flowing members having core portions of non-conductive material of about 1.0 lb/cu ft and a thin conductive layer surrounding said positions, said layer being about 1.times.10.sup.-6 to about 20.times.10.sup.-6 inch in thickness, said metal conductive layer being selected from a group consisting of iron, silver copper, aluminum, nickel and alloys thereof, and a transparent housing composed of an electrically insulating material to confine said free-flowing members therein.

Other info:


Inventors: Friebel, Virgil R. (Longmont, CO, US)
Roller, Kent G. (Boulder, CO, US)
Deitrick, Jack L. (Boulder, CO, US)

Application Number: 904102
Filing Date: 1978-05-08
Publication_date: 1980-06-17
Assignee: Ball Corporation (Muncie, IN)
Primary Class(es): 324/457
Other Classes:
US Patent Ref:
3955630May, 1976Thomas46/233.

Other Refs: Other References: Joseph Alexander et al., A Sourcebook for the Physical Sciences, Harcourt, Brace & World, Inc., New York, 1961, p. 504, FIG. 21-10.
M. Riaz, Electrical Engineering Laboratory Manual, McGraw-Hill Co. 1966, pp. 21.1-21.6, see use of ping-pong balls part 5 of Exp. 21.
Allan S. Kullen et al., Webster's New American Dictionary, p. 737, definition of ping-pong.