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:
Feb. 19, 1991
Filed:
Nov. 02, 1989
Applicant:
Inventor:
Roberto Viazzi, Turin, IT;
Assignee:
RFT S.p.A., Turin, IT;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F01L / ;
U.S. Cl.
CPC ...
1231 / ; 277-95 ; 1231 / ;
Abstract
A seal for the stem of an internal combustion engine intake or exhaust valve; which seal presents a first portion mounted integral with an element supporting the stem; and a second portion inside which are formed two annular lips cooperating in contacting manner with the stem and defining, together and with the stem, an annular chamber inside which part of the lubricating oil supplied when the engine is running is trapped when the engine is idle, thus preventing the sealing lips from drying and sticking to the valve stem.