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. 02, 2004
Filed:
May. 21, 2001
Nobumasa Sugimoto, Suita, JP;
Mitsuhiro Masuda, Moriguchi, JP;
Sanyo Electric Co., Ltd., Osaka, JP;
Abstract
A pressure wave generator comprises an acoustic tube and a driving device connected to one end of the tube for generating acoustic waves toward the interior of the tube A plurality of Helmholtz resonators each having a channel through which the cavity is connected with the interior of the acoustic tube are arranged on the tubular wall of the acoustic tube with suitable axial spacing. Each of the Helmholtz resonators comprises a throat having a narrower in diameter than the acoustic tube and joined at a base end thereof to the tubular wall of the acoustic tube and a cavity joined at the one end of the throat and having a suitable volume. The generator suppresses the generation of shock waves, and generates shock-free larger pressure amplitude than the ones conventionally achieved.