Method and apparatus to increase acoustic separation
CA 2357253 C · Owner: National Research Council Of Canada · Inventors: Ryan, James G.; Stinson, Michael R.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method and apparatus for reducing the acoustic coupling between a sound receiving transducer and a sound transmitting transducer is disclosed. A housing wherein the receiving transducer and the transmitting transducer are mounted is provided to increase the acoustic separation between the receiving transducer and the transmitting transducer. The housing has a surface which may have an acoustic impedance condition which is preferably resistive. The housing may further act as a barrier structure between the receiving transducer and the transmitting transducer.
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 September 12, 2001 and granted June 7, 2011. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 12, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 12, 2023.
- 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.