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:
Jun. 16, 1992
Filed:
Feb. 21, 1991
James G Snyder, North Windham, CT (US);
Richard M Slayton, South Windsor, CT (US);
William E Fuller, West Hartford, CT (US);
Robert J Makowski, deceased, late of Higganum, CT (US);
United Technologies Corporation, Hartford, CT (US);
Abstract
A method and system (10) for rerouting the pressurized oil flow of an engine (not shown) from a primary filter (14) to a secondary filter (18) in the event of a first sensed pressure differential across the primary filter (14) which exceeds an allowable pressure differential, the excessive differential indicative of a primary filter (14) obstruction. In the event of a subsequent second sensed pressure differential which exceeds a second and higher pressure differential across the secondary filter (18), the oil flow is then diverted through a pump relief valve (19) toward the oil reservoir (26), away from an engine bearing compartment (50). The system (10) also provides sequenced first and second level warnings (40, 42) to the controller/flight crew, said warnings responsive to the operating status of the system (10).