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:
Nov. 04, 2003
Filed:
Dec. 21, 2001
John E. Cook, Chatham, CA;
Paul D. Perry, Chatham, CA;
Siemens Canada Limited, Ontario, CA;
Abstract
A leak detection monitor ( ) for an on-board evaporative emission leak detection system that detects leakage from an evaporative emission space of a fuel system of an automotive vehicle. One embodiment ( ) utilizes engine intake system vacuum to vent the evaporative emission space to atmosphere when the engine is running; another ( ), an electromagnet actuator ( ). Venting ceases when the engine is shut off. Changes in vapor pressure in the evaporative emission space are monitored over time by electric devices ( ) after the engine has been shut off to distinguish between a gross leak, a small leak smaller than a gross leak, and a leak that is at most smaller than a small leak.