Segmented ring transducers
CA 2189554 C · Owner: Falcus, Steven John · Inventors: Falcus, Steven John
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A segmented ring transducer comprising a plurality of arcuate ring sections (21) coupled together each section (21) comprising a, plurality of rectangular piezoelectric ceramic blocks (22) arranged into a stack (27 28) with one or more tapered wedges (23) spaced in the stack, the piezoelectric stack (27, 28) being assembled between opposed end couplings (24 25), pre-stress bolts (26) connecting together the opposed end couplings (24, 25) in each ring section (21) to hold together each ring section assembly (21). The arcuate ring sections (21) can be identical. Adjacent ring sections (21) can be connected together by further bolts. Alternatively the ring transducer can be, formed as a split …
Read the whole patent
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
- Filed May 5, 1995 and granted August 19, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 5, 2015.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 5, 2017.
- 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.