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:
May. 24, 2005
Filed:
Aug. 07, 2003
Applicants:
Wilfried Schneiders, Bochum, DE;
Theodor Schmitte, Bochum, DE;
Jörn Grossmann, Hattingen, DE;
Inventors:
Assignee:
Doncasters Precision Castings-Bochum GmbH, Bochum, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B22C009/04 ; B22C009/10 ; B22C021/14 ;
U.S. Cl.
CPC ...
Abstract
To prevent movement of a ceramic core in a ceramic shell for the investment casting of a turbine blade, the free end of the core has one or more pins embedded therein so that the pins project into both the core and the ceramic shell which is applied over a wax layer. After removal of the wax and firing of the shell, molten metal is cast in the space left by the wax between the core and the shell. After hardening of the metal, the outwardly projecting part of the pins are removed during the machining of the surfaces of the turbine blade blank.