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. 08, 1993
Filed:
Sep. 04, 1992
Bogdan Cherek, Peterborough, CA;
Milltronics Ltd., Peterborough, CA;
Abstract
A flexural mode acoustic transducer system for use in pulse-echo ranging systems has a radiating plate of which even-numbered antinodal zones, counting from a drive connection to a driving element at the center of the plate, are formed with rings of apertures to reduce the radiating areas of those zones, thus reducing cancellation in the far field, and improving the matching of the device to the atmosphere into which the plate is radiating. The plate is backed by a sound deadening layer on a flange of a transducer housing, from which it is separated by a foil which is non-adherent to the plate, and is preferably covered by an acoustically transparent fabric having a pore size small enough to exclude damaging particulates.