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. 26, 2002
Filed:
Jun. 16, 2000
Robert A. Zurek, Antioch, IL (US);
Aaron Dietrich, Caledonia, IL (US);
Michael L. Charlier, Palatine, IL (US);
Motorola, Inc., Schaumburg, IL (US);
Abstract
An ultrasonic communication system includes an omnidirectional ultrasonic transducer including a housing having a closed side and an open side defining an aperture in the housing. A diaphragm is mounted into the housing to form a sealed cavity between the diaphragm and the closed side of the housing. A second side of the diaphragm is free to transmit ultrasonic signals through the aperture. The diaphragm and aperture both have a largest dimension that is less than or equal to one-quarter wavelength of an ultrasonic signal to be transmitted by the transducer, such that the transducer behaves as a monopole and radiates substantially omnidirectionally.