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US Patent: 4,527,449
Boring bit and method for manufacture thereof
Harrold A. Trent - San Leandro, CA
William E. Sydlowski - Wakefield, MA

USPTO Classifications:
408/16, 408/225, 408/226, 76/108.1

Tool Categories:
woodworking machines : wood drilling and boring : wood drill bits

Rule Industries, Inc. - Gloucester, MA

Not known to have been produced


Patent Dates:
Applied: Sep. 13, 1982
Granted: Jul. 09, 1985

Patent Pictures:
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There are disclosed herein power tool boring bits having boring depth indicating markings on the shanks thereof. The markings are produced by colored oxiding of substantially the entire shank of the tool followed by selective abrasion of the shank to remove bands of substantially only the thin surface oxide in alternate array with bands of the colored oxide.

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