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. 08, 2005
Filed:
Feb. 10, 2003
Tetsuo Yamaguchi, Sowa-machi, JP;
Mitsuo Iwasaki, Sowa-machi, JP;
Takao Ishido, Sowa-machi, JP;
Takaaki Kusama, Sowa-machi, JP;
Mitsuo Nanjyo, Sowa-machi, JP;
Shigeru Matsumura, Tokyo, JP;
Shigeru Murayama, Tokyo, JP;
Tetsuo Yamaguchi, Sowa-machi, JP;
Mitsuo Iwasaki, Sowa-machi, JP;
Takao Ishido, Sowa-machi, JP;
Takaaki Kusama, Sowa-machi, JP;
Mitsuo Nanjyo, Sowa-machi, JP;
Shigeru Matsumura, Tokyo, JP;
Shigeru Murayama, Tokyo, JP;
Hirakawa Hewtech Corporation, Tokyo, JP;
Advantest Corporation, Tokyo, JP;
Abstract
A foamed coaxial cable with high precision according to the present invention comprises: an internal conductor twisted with a plurality of electrically conductive wires; a foamed insulator with its low dielectric constant made of a porous tape body formed on the outer periphery of this internal conductor; an external conductor made of a number of electrically conductive thin wires braided on the outer periphery of this foamed insulator; and an outer sheath made of a resin having heat resistance formed on the outer periphery of this external insulator, wherein the precision of external diameter of the internal conductor is 4/1000 mm or less, the precision of external diameter size of the foamed insulator is ±0.02 mm, the insulator is formed in a completely circular shape, the precision of external diameter size of the external conductor is ±2%, the external conductor is formed in a completely circular shape, and the precision of characteristic impedance value between the internal conductor and the external conductor having the foamed insulator interposed therebetween is ±1 Ω.