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:
Mar. 31, 2020
Filed:
Aug. 28, 2015
Applicant:
Ehwa Diamond Industrial Co., Ltd., Osan-si, Gyeonggi-do, KR;
Inventors:
Ki-Ho Kim, Seongnam-si, KR;
Jun-Yong Yun, Suwon-si, KR;
Assignee:
EHWA DIAMOND INDUSTRIAL CO., LTD., Osan-si, Gyeonggi-do, KR;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
E21B 10/46 (2006.01); E21B 10/55 (2006.01); B23P 5/00 (2006.01); C21D 9/22 (2006.01); C22C 38/00 (2006.01); C22C 38/02 (2006.01); C22C 38/22 (2006.01); C22C 38/32 (2006.01); C22C 38/38 (2006.01); E21B 10/02 (2006.01); C21D 1/42 (2006.01);
U.S. Cl.
CPC ...
E21B 10/55 (2013.01); B23P 5/00 (2013.01); C21D 9/22 (2013.01); C22C 38/002 (2013.01); C22C 38/02 (2013.01); C22C 38/22 (2013.01); C22C 38/32 (2013.01); C22C 38/38 (2013.01); E21B 10/02 (2013.01); E21B 10/46 (2013.01); C21D 1/42 (2013.01); C21D 2211/002 (2013.01); C21D 2211/005 (2013.01); C21D 2211/008 (2013.01); C21D 2211/009 (2013.01);
Abstract
Disclosed are a drill bit for drilling and a method for manufacturing same, in which the hardness of a body part of a shank can be selectively improved by performing rapid cooling in a forced cooling method after performing rapid heating selectively only on the body part of the shank in a high-frequency induction heating method after completing infiltration.