Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
David N. Johnson0
Florian Probst0
Thomas J. Quinn0
Date of Patent
May 10, 2016
0Patent Application Number
145668670
Date Filed
December 11, 2014
0Patent Citations Received
Patent Primary Examiner
Patent abstract
A chisel includes an elongate shank portion composed of a first steel, and a working end portion composed of a second steel that is different than the first steel. The working end portion is joined to the shank and configured to chisel a workpiece. The joined shank portion and working end portion has been heat treated to cause the first steel of the shank portion to adopt a first microstructure comprising bainite, the second steel of the working end portion to adopt a second microstructure comprising martensite, and the working end portion to have a greater hardness than the shank portion.
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