Surround sound system
CA 2132763 C · Owner: Taglione, John V. · Inventors: Helms, Richard Morgan; Moogk, Peter G.; Taglione, John V.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An upgrade for a stereo enabled computer system which enables such a system to produce and record surround sound channels is disclosed. Such surround sound channels are played or recorded using an additional audio card which, controls additional speakers and/or microphones which is, added to the computer system. Software for redirecting instructions from existing stereo application programs and sending these instructions to the existing audio device driver and the additional audio device driver is provided. A means for processing the digital audio data for either extracting surround sound channels from two channel data provided by the application, or for encoding two sets of two channel …
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 23, 1994 and granted March 30, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 23, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 23, 2016.
- 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.