System and method for testing adequacy of human hearing
CA 2117774 C · Owner: Sensimetrics Corporation · Inventors: Rabinowitz, William M.; Zurek, Patrick M.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Disclosed is a system and method for measuring hearing in which multiple single-frequency tones are presented by each of two transducer (64, 66), each transducer presenting only one single-frequency tone. One transducer is employed to present a plurality of f1 primaries, each in a different location of the range of audible frequencies, and the other transducer a plurality of corresponding f2 primaries, each having a frequency with respect to its corresponding f1 so as to make the ratio of frequencies suitable for the production of EDPs by that pair. By selection of an appropriate frequency far each primary in each set a plurality of pairs may be presented to the ear simultaneously …
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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 April 8, 1993 and granted October 14, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 8, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 8, 2015.
- 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.