US PATENT SUBCLASS 76 / 24.5
.~.~ Chemically sharpening

Current as of: June, 1999
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76 /   HD   METAL TOOLS AND IMPLEMENTS, MAKING

12  DF  FILE CUTTING {9}
24.1  DF  .~ Process {1}
24.5.~.~ Chemically sharpening

DEFINITION

Classification: 76/24.5

Chemically sharpening:

(under subclass 24.1) Method of restoring previously sharpened cutting edges of a file or rasp to sharp condition by application of a chemical that modifies the surface characteristics thereof.