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. 12, 2012
Filed:
Apr. 29, 2008
Jonathan Edwards Mccallum, Edmonton, CA;
George Antoszko, Edmonton, CA;
Kevin John Dewar, Edmonton, CA;
Andrew Louis Norell, St. Albert, CA;
Cameron Dean Westbrook, Devon, CA;
Terry Dean Nelson, Edmonton, CA;
Brendan Anthony Romano, Sherwood Park, CA;
Jonathan Edwards McCallum, Edmonton, CA;
George Antoszko, Edmonton, CA;
Kevin John Dewar, Edmonton, CA;
Andrew Louis Norell, St. Albert, CA;
Cameron Dean Westbrook, Devon, CA;
Terry Dean Nelson, Edmonton, CA;
Brendan Anthony Romano, Sherwood Park, CA;
Flexxaire Manufacturing Inc., Edmonton, CA;
Abstract
A compact variable pitch fan has a hydraulic pitch change mechanism. A pitch change piston is constrained to follow reciprocating motion under hydraulic control within a peripheral hub from which fan blades extend outward. An additional feature is the use of separated guiding and seal surfaces. A still further feature is the use of a pitch sensor, particularly on the hydraulic line leading to the variable pitch fan.