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:
Jan. 09, 2007
Filed:
Oct. 07, 2004
Applicants:
James G. Schroth, Troy, MI (US);
Richard H. Hammar, Utica, MI (US);
Inventors:
James G. Schroth, Troy, MI (US);
Richard H. Hammar, Utica, MI (US);
Assignee:
General Motors Corporation, Detroit, MI (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B21D 37/16 (2006.01); B21D 39/20 (2006.01);
U.S. Cl.
CPC ...
Abstract
A hot forming tool is heated with multiple electrical resistance cartridge heaters. The heaters are located in the body of the tool so as to maintain the entire forming surface within a predetermined temperature range. Numerical thermal and optimization analyses direct the placement of the heaters so that when each heating element is simultaneously powered on for an identical fraction of the time, an acceptable temperature distribution will be produced within the tool at the tool operating temperature.