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. 28, 2015
Filed:
Nov. 29, 2011
Ian A. Macfarlane, St. Bruno, CA;
Ian A. Macfarlane, St. Bruno, CA;
PRATT & WHITNEY CANADA CORP., Longueuil, CA;
Abstract
Systems and methods for changing a speed ratio between a compressor boost stage () and at least one power turbine () of a gas turbine engine () are described. Such a system may comprise a coupling device () configured to selectively transmit energy from the at least one power turbine () to the boost stage () according to at least a first speed ratio and a second speed ratio. The system may also comprise an auxiliary power device () configured to cause a rotational speed of the boost stage () to change from a first speed corresponding substantially to the first speed ratio to a second speed corresponding substantially to the second speed ratio when the boost stage () is decoupled from the at least one power turbine ().