Emat transmit/receive switch
CA 2391339 C · Owner: Mcdermott Technology, Inc. · Inventors: Overby, Charles B.; Maclauchlan, Daniel T.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A transmitting and receiving switch assembly for an electromagnetic acoustic transducer (EMAT) and a method for selectively switching an EMAT between transmit mode and receive mode both use a particular circuit. This circuit contains an EMAT coil (20) coupled to a tuning capacitor (10) which allows , the EMAT to be operated at a desired frequency when transmitting. A set of capacitors (40, 42) separates the EMAT coil (20) from a set of diode strings (70, 72) (preferably containing at least one fast switching diode) which are , joined by a resistive connection (61 62, 63, 64). A transformer (50), which is center tapped at its primary winding is coupled to the other end of the , diode …
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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
- Filed August 15, 2000 and granted December 30, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 15, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 15, 2022.
- 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.