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. 28, 2008
Filed:
Oct. 11, 2006
Applicant:
Keiichi Takayanagi, Isesaki, JP;
Inventor:
Keiichi Takayanagi, Isesaki, JP;
Assignee:
Hitachi, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F02M 33/02 (2006.01);
U.S. Cl.
CPC ...
Abstract
A leak diagnosing technology in which a diagnostic space capable of being closed is defined which includes therein a fuel tank and a canister, the closed diagnostic space being pressurized by an air pump to diagnose of presence or absence of a leak in the diagnostic space based on whether or not a pressure in the diagnostic space indicates a predetermined pressure change. When the diagnosis is completed, the air pump is reversely rotated to cause a reduction in the pressure in the diagnostic space to thereby quickly return the pressure to a target pressure in a steady state.