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. 02, 1993
Filed:
Aug. 31, 1992
Applicant:
Inventor:
Frederick G Wietig, West Falls, NY (US);
Assignee:
Val-Kro, Inc., Tonawanda, NY (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F01L / ;
U.S. Cl.
CPC ...
1231883 ; 1231886 ; 12318811 ; 298884 ;
Abstract
The novel valve of this invention is for use in internal combustion engines. With advanced engine technology of today, prior art valves are not suitable because of wear problems. The valve of this invention provides a valve stem texture that is smooth enough to cause minimal wear on contacting parts while at the same time rough enough to retain sufficient oil to lubricate the parts. This is accomplished by having a stem surface with a surface peak height of Rp 4.0 to 15.0 and cross hatching on the affected surface portions. The cross hatching has a depth having an Rvk value of up to 30 micro-inches.