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:
Nov. 10, 2009
Filed:
Jun. 05, 2007
Applicants:
Dan Baker, Medina, OH (US);
Wayne C. Goeke, Hudson, OH (US);
Inventors:
Dan Baker, Medina, OH (US);
Wayne C. Goeke, Hudson, OH (US);
Assignee:
Keithley Instruments, Inc., Cleveland, OH (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01F 27/28 (2006.01);
U.S. Cl.
CPC ...
Abstract
A toroidal step-up or step-down transformer includes a toroidal magnetic core, a primary formed from a plurality of primary windings, and a secondary formed from a plurality of secondary windings. Parallel connected windings are added to at least one of the primary and secondary to make the number of primary windings equal to the number of secondary windings, the primary and secondary windings being arranged symmetrically around the core.