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. 29, 1992
Filed:
Sep. 24, 1990
Minoru Taguchi, Tokyo, JP;
Harada Industry Co., Ltd., Tokyo, JP;
Abstract
An automobile antenna of a rod shape comprises an antenna element and a hollow cylindrical member of a resin fitted on the circumference of the antenna element. The hollow cylindrical member includes a plurality of hollow cylindrical units that may be coupled together or may be spaced apart. The cylindrical member has a ridge or ridges in the form of a spiral or ring. The ridge functions to generate a turbulent flow of air when the automobile runs at a high speed, so that a whistling sound generated by the wind blow may be eliminated. The method of making an antenna uses two offset molds having a plurality of cavities by the provision of spaced apart partitions, which also support the antenna element. A molding material is supplied into the cavities so that the ridges-bearing cylindrical member and the antenna element may be fabricated as one unit. Portions of the antenna element supported by the partitions, after molding operation, are exposed externally to attain an improved whistling sound elimination function.