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:
Mar. 12, 2013
Filed:
May. 18, 2011
Applicants:
Lawrence D. Graham, Chagrin Falls, OH (US);
James Barrett, Milwaukie, OR (US);
Don Deptowicz, Berthound, CO (US);
Inventors:
Lawrence D. Graham, Chagrin Falls, OH (US);
James Barrett, Milwaukie, OR (US);
Don Deptowicz, Berthound, CO (US);
Assignee:
PCC Airfoils, Inc., Beachwood, OH (US);
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B22D 29/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
A cast metal article is formed with an internal cavity. The internal cavity is formed by a ceramic core which is removed from the cast metal article to leave the cavity. The ceramic core is formed with a cavity to facilitate removal of the core from the cast metal article. To remove the core from the cast metal article, the cavity in the core is filled with a leaching liquid.