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:
Aug. 18, 1987
Filed:
Jul. 05, 1985
Michael W Lock, Bedford, GB;
Internationale Octrooi Maatschappij 'Octropa' BV, Rotterdam, NL;
Abstract
A standing wave is produced by interaction between the outputs of a pair of ultrasonic transducers driven by respective signal generating means. A phase interlock determines the phase difference between the signals and thus is progressively changed by a control signal regulated by a digital control means operated by a program so as to produce stepwise phase differences between the transducers in a cyclically varying manner. As a result, a sequence of momentary phase changes occur between the outputs of the signal generating means so that the standing wave is caused to move at a rate dependent upon the programmed operation of the digital control means.