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:
Jul. 14, 2026
Filed:
Dec. 30, 2022
Pratt & Whitney Canada Corp., Longueuil, CA;
Jagoda Krzywon, Longueuil, CA;
PRATT & WHITNEY CANADA CORP., Longueuil, CA;
Abstract
The rotor control system includes a main control valve having an inlet for receiving liquid and an outlet for issuing liquid to a rotor pitch change actuator. The rotor control unit is configured to control flow of liquid from the inlet to the outlet to modify pitch angle of rotor blades. A feathering system with a first conduit connected in fluid communication with the outlet of the main control valve, a second conduit for fluid communication with the rotor pitch change actuator, and a drain conduit. The feathering system has a normal operation mode for supplying liquid from the main control valve to the rotor pitch change actuator by allowing flow through the feathering system from the first conduit to the second conduit. The feathering system has a feathering mode for controlling drainage from the rotor pitch change actuator to the drain conduit.