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:
Oct. 15, 2019
Filed:
Jul. 09, 2018
Man Diesel & Turbo, Filial AF Man Diesel & Turbo Se, Tyskland, Copenhagen SV, DK;
Harro Andreas Hoeg, Allerød, DK;
Christian Skaaning, Copenhagen, DK;
MAN DIESEL & TURBO, FILIAL AF MAN DIESEL & TURBO SE. TYSKLAND, Copenhagen SV, DK;
Abstract
An exhaust valve for an internal combustion engine comprises a valve disc having a first side () and a second side (), a valve stem extending from the first side of the valve disc, and an annular valve seat area () located at the first side of the valve disc. The annular valve seat area () is of a nickel-base alloy or a chromium-base alloy and has a valve seat surface. The annular valve seat area has at least a first annular portion () located in between two second annular portions (). The first annular portion has lower hardness than the two second annular portions.