The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 10, 2016
Filed:
Dec. 11, 2014
Applicant:
Black & Decker Inc., Newark, DE (US);
Inventors:
Assignee:
BLACK & DECKER INC., New Britain, CT (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B25D 17/02 (2006.01); E21C 35/18 (2006.01); C21D 1/613 (2006.01); C21D 9/50 (2006.01); C22C 38/18 (2006.01); B23K 31/02 (2006.01); B23K 37/00 (2006.01); B28D 1/26 (2006.01); C21D 6/00 (2006.01); C21D 9/22 (2006.01); C22C 38/00 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/22 (2006.01); C22C 38/24 (2006.01); C22C 38/44 (2006.01);
U.S. Cl.
CPC ...
B25D 17/02 (2013.01); B23K 31/025 (2013.01); B23K 37/00 (2013.01); B28D 1/26 (2013.01); C21D 1/613 (2013.01); C21D 6/002 (2013.01); C21D 6/004 (2013.01); C21D 9/22 (2013.01); C21D 9/50 (2013.01); C21D 9/505 (2013.01); C22C 38/002 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/18 (2013.01); C22C 38/22 (2013.01); C22C 38/24 (2013.01); C22C 38/44 (2013.01); E21C 35/18 (2013.01); B25D 2222/42 (2013.01); C21D 2211/002 (2013.01); C21D 2211/008 (2013.01); Y10T 408/89 (2015.01);
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.