Microphone and loudspeaker system
CA 2076288 C · Owner: Wehner, Raymond · Inventors: Wehner, Raymond
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
27-, A sound receiving and sound reproduction apparatus includes a microphone and loud speaker. The microphone has a cylindrical transducer housing with a centre, section to and two end sections. The centre section has elliptical end faces that converge, mirror-symmetrically downwardly and towards the front of the microphone. The end, sections are solid blocks that are spaced from the centre section and have similarly oriented, end faces. In the loudspeaker there are three components, a center unit with center and, end sections spaced slightly along a common axis and two end components spaced to, opposite ends of the centre unit . In each case the speakers radiate through , elliptical …
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 August 18, 1992 and granted January 30, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 18, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 18, 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.