Hearing aid
CA 2178754 C · Owner: Hill, Frank C. · Inventors: Hill, Frank C.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A hearing aid (30) including a, microphone (32) fitted through a small hole (34) in the conchal bowl (14) of, the user to receive sound impinging the anterior side (40) of the pinna (12), an electronics package (36) wound behind, the pinna that receives the sound from the microphone, and a sound conductor, (50) running from the electronics package behind the ear through the soft tissue of the external auditory canal medial to the cerumen-producing portion, (26) of the canal.
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 December 14, 1994 and granted November 3, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 14, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 14, 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.