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:
Jun. 17, 2003
Filed:
Sep. 08, 2000
Nagoya University, , JP;
Abstract
An apparatus for generating compression waves in a conductive liquid comprises a vessel containing a conductive liquid and ac electromagnetic force applying means provided around the vessels for generating the compression waves to achieve improvement after solidification of the liquid by enchancing strength of the compression waves by setting the ac frequency “f” of ac electromagnetic force applying means only within the range defined by the expression 2/(L &pgr;&mgr;&sgr;)≦f≦(c &mgr;&sgr;)/2&pgr;, wherein f is a major frequency when a waveform of an electromagnetic force is developed by the Fourier transform, for a non-sine waveform, L is a characteristic length of the system, such as a depth or a radius of the vessel, &mgr; is the permeability of the conductive liquid, &sgr; is the electric conductivity of the conductive liquid, and c is the propagation velocity of the compression waves in the conductive liquid.