Method for making the human voice audible and comprehensible to deep deaf persons as based on the multiple frequency translation technique by means of input signal sampling and input and output filterings and apparatus for carrying out such a method

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

• Granted January 25, 1972. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 25, 1989.
• We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.