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:
Oct. 14, 1997
Filed:
Jan. 17, 1995
Bizhan Dorri, Clifton Park, NY (US);
General Electric Company, Schenectady, NY (US);
Abstract
A method for passively shimming a magnet having a magnetic field with an inhomogeneity and having N possible passive shim locations. The magnetic field is mapped. A function is defined related to the mapped field as affected by N shim variables of positive shim strength and M shim variables of negative shim strength. A computer optimization code is run which calculates the positive strengths of the N shim variables and the negative strengths of the M shim variables which minimizes the defined function. Positive strengths of passive shims are added to the magnet corresponding to the calculated positive strengths of the N shim variables and positive strengths of passive shims are removed from the magnet corresponding to the calculated negative strengths of the M shim variables.