Tri-select hearing assist
CA 2008624 C · Owner: Mackey, James Terrence · Inventors: Mackey, James Terrence
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A plug-in control box to TV or radio (2-pole 3-position, rotary switch, non-shorting) is capable of providing sound from TV or radio speakers, earphones alone, or speakers and earphones together. In the speaker position, the sound level is adjusted for general surroundings. In the earphone position the, TV/radio speaker sound is omitted. If necessary the earphone, level can be further adjusted to suit the earphone listener. In speaker and earphone position the TV/radio sound can be, adjusted if necessary and the earphone sound separately. These settings are for normal hearing. The big feature of this invention is provision for the hearing impaired. An amplifier, built into the control box …
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 January 26, 1990 and granted May 24, 1994. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 26, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 26, 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.