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. 14, 2012
Filed:
Oct. 16, 2008
Applicants:
Calvin W. Emmerson, San Diego, CA (US);
Robert A. Ress, Jr., Carmel, IN (US);
Stephen N. Hammond, Brownsburg, IN (US);
Inventors:
Calvin W. Emmerson, San Diego, CA (US);
Robert A. Ress, Jr., Carmel, IN (US);
Stephen N. Hammond, Brownsburg, IN (US);
Assignee:
Rolls-Royce North American Technologies, Inc., Indianapolis, IN (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B64C 11/24 (2006.01); F01D 5/18 (2006.01);
U.S. Cl.
CPC ...
Abstract
In one embodiment a centrifugal impeller has an axis of rotation, a plurality of blades, and a plurality of pitches defined between the blades. A cavity may be formed in a back side of the impeller, opposite with at least one of the plurality of pitches. In one form the cavity may not extend below a radius determined according to a stress criteria or stress limitation.