Acoustically coupled antenna
CA 2056367 A1 · Owner: Iowa State University Research Foundation · Inventors: Weber, Robert J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An acoustically coupled antenna (20) which can be configured as a transmitting or receiving antenna for coupling between an electrical circuit (22) (transmitter or receiver) and an electromagnetic propagating medium (25) such as the atmosphere. The antenna is a two port device in which one port (21) is connected to the electrical circuit (22) and the second port (23) includes a transducer (24) which interfaces (radiates or receives ) electromagnetic energy with the propagating medium (25). The ports are acoustically coupled to each other by forming the device as a stacked crystal filter with three conductive electrodes (30 31, 32), separated by two piezoelectric resonating elements (33 34). …
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 30, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 30, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 30, 2012.
- 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.