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. 20, 2025
Filed:
Dec. 31, 2020
Applicant:
Erae Ams Co., Ltd., Daegu, KR;
Inventors:
Se Jung Park, Daegu, KR;
Dal Soo Jang, Daegu, KR;
Assignee:
ERAE AMS CO., LTD., Daegu, KR;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C21D 9/28 (2006.01); C21D 1/06 (2006.01); C21D 1/18 (2006.01); C21D 8/10 (2006.01); C23C 8/22 (2006.01); C23C 8/80 (2006.01);
U.S. Cl.
CPC ...
C21D 9/28 (2013.01); C21D 1/06 (2013.01); C21D 1/18 (2013.01); C21D 8/105 (2013.01); C23C 8/22 (2013.01); C23C 8/80 (2013.01); C21D 2211/002 (2013.01); C21D 2211/008 (2013.01);
Abstract
in a heat treatment method for a tubular shaft for a drive shaft having a ball spline structure for a plunging and an undercut region with a reduced diameter, a carburizing-austempering is performed such that a deep portion hardness of the undercut region is a value between HRC 35 to HRC 50.
Park, Se. (2025). Heat treatment method for tubular shaft for drive shaft having ball spline structure and tubular shaft manufactured thereby (U.S. Patent No. 12305251). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/12305251
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile