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:
Sep. 20, 1983
Filed:
Sep. 08, 1981
Takesada Sasaki, Machida, JP;
Hiroshi Endo, Zama, JP;
Yoshimasa Zama, Sagamihara, JP;
Masahiko Shiraishi, Nakatsu, JP;
Yosinari Miura, Nakatsu, JP;
Masayuki Yamaguchi, Nakatsu, JP;
Nippon Steel Corporation, Tokyo, JP;
Abstract
The present invention relates to a steel tubing and more particularly a composite dual tubing which can be suitably used for an exhaust pipe capable of effectively decreasing the radiated noise from the exhaust pipe of automobile. Several known dual tubings are effective occasionally for the reduction of radiated noise, but their effects are drastically reduced at high temperature. A metallic dual tubing of the present invention comprises an inner tube (10) and an outer tube (20) and is, characterized in that the metallic dual tubing is provided with an intermediate layer (18) comprising combustible material filled between the inner tube (10) and the outer tube (20). This layer may be single layer consisting of the combustible material or of the mixture of such material with a heat-resistant material. The intermediate layer may be a dual layer of the combustible material and the heat-resistant material.