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. 07, 2023
Filed:
Mar. 02, 2020
Applicants:
Hyundai Motor Company, Seoul, KR;
Kia Motors Corporation, Seoul, KR;
Inventor:
Sung Hwan Park, Gyeonggi-do, KR;
Assignees:
Hyundai Motor Company, Seoul, KR;
Kia Motors Corporation, Seoul, KR;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C21D 10/00 (2006.01); C21D 8/00 (2006.01); B21D 31/06 (2006.01); B21D 53/10 (2006.01); F01L 3/02 (2006.01);
U.S. Cl.
CPC ...
C21D 8/005 (2013.01); B21D 31/06 (2013.01); B21D 53/10 (2013.01); C21D 10/00 (2013.01); F01L 3/02 (2013.01);
Abstract
A method of preparing an engine valve is provided. The method includes hot forging a heat resistant steel at 1,150 to 1,250° C. to mold a valve, aging the molded valve and hollowed-out processing the aging valve. Additionally, the method includes nitride-heating the hollow valve and grinding a surface of a neck of the nitride-heated valve to remove a nitride layer.