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. 08, 2008
Filed:
Dec. 09, 2002
Hitoshi Yoshimori, Nara, JP;
Hitoshi Yoshimori, Nara, JP;
SHT Corporation Limited, Osaka-shi, JP;
Abstract
The present invention provides an air-core coilwherein one conductor is wound into a spiral form to thereby form consecutively, axially of the coil, a plurality of unit turn portions () which are different from each other in inner peripheral length and to form, axially of the coil, unit coil portions comprising the plurality of unit turn portions () to produce a partly finished coil, and thereafter the partly finished coilis compressed to force the unit turn portion of small inner peripheral length inwardly of the unit turn portion of great inner peripheral length from among the unit turn portions providing each of the unit coil portions to thereby make each of the unit coil portions multi-layered. Thus the air-core coilexhibits a smaller voltage across layers than conventionally and excellent frequency characteristics.