Method of manufacturing an apodized ultrasound transducer
CA 1201824 A · Owner: North American Philips Corporation · Inventors: 'T Hoen, Pieter J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Method of manufacturing an apodized ultrasound transducer." The method comprises the fabricating of a transducer having an active surface from a plate (100) of piezoelectric ceramic material and the selective polarizing of localized regions of the ceramic material so that the degree of polarization of the ceramic material has a profile which decreases from a central point or line on the active surface to the edges of the active surface. The method is very simple in that the selective polarizing comprises a first step which consists of the uniform polarizing of the piezoelectric material and a second stop which consists of the partial depolarizing of selected regions of the piezoelectric …
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Granted March 11, 1986. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 11, 2003.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.