Acoustic signal reproducing apparatus
CA 2049295 C · Owner: Iida, Yasuhiro · Inventors: Yabe, Susumu; Inanaga, Kiyofumi; Iida, Yasuhiro
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
With an acoustic signal reproducing apparatus according to the present invention, position-detecting reference signals from reference signal source are sensed by a pair of signal sensors, provided at two places over a listener's head M, the turning angle and the relative distance of the head with respect to the reference signal source are calculated by processing units on the basis of these signal sensors transmission, characteristics with respect to an arbitrarily positioned imaginary sound source are found from the information concerning said relative distance and said turning angle, with said reference signal source as a reference position, and acoustic signals are processed by acoustic …
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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 January 18, 1991 and granted June 23, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 18, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 18, 2013.
- 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.