Non-occludable transducer for in-the-ear applications
CA 2084005 C · Owner: Madaffari, Peter L. · Inventors: Tibbetts, George C.; Madaffari, Peter L.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An in-the-ear electroacoustic transducer is constructed to limit the effect of accretion of cerumen on acoustically active surfaces: to prevent cerumen from plugging passages for acoustical energy to the tympanic membrane and to facilitate the removal of cerumen from the transducer by the user. A casing has a hollow tubular wall and diaphragm, means is mounted to the casing near one end thereof the casing being shaped for insertion in the ear to define a space generally bounded by the ear canal the tympanic membrane and the diaphragm means. The diaphragm means has a flexible film surround and, stop means are provided to limit its movement inwardly of the casing. The transducer can be …
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 November 27, 1992 and granted May 16, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 27, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 27, 2014.
- 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.