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:
Aug. 06, 1991
Filed:
May. 04, 1990
Applicant:
Inventor:
Kenneth A Conti, Barrington, RI (US);
Assignee:
Allied-Signal Inc., Morristown, NJ (US);
Attorneys:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G01N / ;
U.S. Cl.
CPC ...
73 38 ; 116D / ;
Abstract
A method and apparatus for predicting the remaining service life of an air filter element reads the pressure drop across the filter element at regular usage intervals (such as engine run time or distance the vehicle has traveled). An approximation of the rate at which the pressure drop is increasing is made, which is used to calculate the usage at which the maximum pressure drop will be attained.