Chalk dot marker

Details Chalk dot marker Chalk dot marker

1994-05-09

1995-12-26

Will, Thomas B.

Geometrical instruments

Gauge

With point marker

33669, 33644, B25H 704

Patent

active

054776201

ABSTRACT:
A chalk dot marker including a soft foamlike cylinder having a central hole and furthermore being impregnated throughout with marking substance such as powdered chalk. An end of the foamlike cylinder has an adhesive surface layer thereupon attaching to an existing assembly and an impermeable membrane disposed upon an opposing surface. The chalk dot marker is adhesively attached to an assembly which is to be affixed to a surface requiring drilled holes. The assembly is positioned upon the surface and force is applied wherein the force compresses the chalk dot marker thereby releasing marker materials which form a dot at the center thereof.

REFERENCES:
patent: D309156 (1990-07-01), Kuwabara
patent: 2675625 (1954-04-01), Rayl, Sr.
patent: 2975520 (1961-03-01), Ericson et al.
patent: 3451370 (1969-06-01), Matesan
patent: 3874326 (1975-04-01), Pickens
patent: 3913235 (1975-10-01), Tenneson et al.
patent: 4144651 (1979-03-01), De Baun
patent: 4338724 (1982-07-01), Johnson
patent: 4345381 (1982-08-01), Brislin
patent: 4589211 (1986-05-01), Policka
patent: 4864732 (1989-09-01), Landy

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