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:
Mar. 28, 2006
Filed:
Mar. 18, 2004
Takashi Kaku, Tokyo, JP;
Fumishiro Tsuda, Sendai Miyagi, JP;
Toshiro Tojo, Tokyo, JP;
Toyomi Obikawa, Tokyo, JP;
Toshiya Sato, Sendai Miyagi, JP;
Hideaki Yamauchi, Sendai Miyagi, JP;
Masahiko Kunii, Sendai Miyagi, JP;
Takashi Kaku, Tokyo, JP;
Fumishiro Tsuda, Sendai Miyagi, JP;
Toshiro Tojo, Tokyo, JP;
Toyomi Obikawa, Tokyo, JP;
Toshiya Sato, Sendai Miyagi, JP;
Hideaki Yamauchi, Sendai Miyagi, JP;
Masahiko Kunii, Sendai Miyagi, JP;
Honda Electron Co., Ltd., Tokyo, JP;
NEC Tokin Corporation, Sendai, JP;
Abstract
A modem coupling circuit comprising: (a) a transformerhaving a coreincluding a gap formed therein, primary windings N, Nconstituting a bifilar wound coil which is wound around the core, forming a single layer and connected to power lines L, L, and a secondary winding Nconnected to a transmitting circuitand a secondary winding Nconnected to a receiving circuit, the secondary windings N, Nholding the single layer of the primary windings between; (b) a coupling capacitor Cconnected to a middle point between first ends of the primary windings, the first ends being not connected to the power lines L, L; (c) current limiting resistances R, Rconnected to the primary windings N, Nhaving a bifilar construction; (d) drive resistances R, Rconnected to the secondary winding for transmission N; and (e) terminating resistances R, Rconnected to the secondary winding for reception N