Colored lead pencil

Details Colored lead pencil Colored lead pencil

1998-12-18

2000-05-02

Bell, Mark L.

Compositions: coating or plastic

Coating or plastic compositions

Marking

106 3111, C09D 1300

Patent

active

060568100

ABSTRACT:
The invention relates to a colored pencil lead having an essentially water-free base material that is at least partially water-soluble or can be suspended in water, which base material contains at least one dye and at least one reactant present in a solid form, wherein this reactant, when in a watery solution, causes a change in color in the dye.

REFERENCES:
patent: 3627546 (1971-12-01), Coppeta et al.
patent: 3957495 (1976-05-01), Teranishi et al.
patent: 4441928 (1984-04-01), Iijima
patent: 5464470 (1995-11-01), Brachman et al.
patent: 5503665 (1996-04-01), Miller et al.
patent: 5534587 (1996-07-01), Smith
Derwent No. 93-022234/03 of JP 04348998-A, Jan. 18, 1991.
Derwent No. 80-A9458C/05, Dec. 1979.
Derwent No. 93-169729/21 of JP 05099927-A, Oct. 9, 1991.

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