Ear wax barrier and acoustic attenuator for hearing aid
CA 2018732 C · Owner: Beltone Electronics Corporation · Inventors: Weiss, Erwin M.; Stanton, Mark F.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A barrier for a hearing aid that combines the feature of both (1) preventing ear wax from contacting and damaging the internal components of a hearing aid or hearing aid receiver and (2) variably dampening the acoustic response of the hearing aid. The barrier includes in combination, a housing defining a, central axis of passage as well as a plurality of projections, and a screen. The projections extend inwardly from the interior surface of the housing, each projection partially occluding the cross-sectional area of the housing. The projections provide a tortuous path for ear wax migrating into the hearing aid and the, screen provides additional area for wax accumulation. The projections …
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 June 11, 1990 and granted April 20, 1993. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 11, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 11, 2012.
- 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.