Audio transducer
CA 1284837 C · Owner: Highwood Audio Inc. · Inventors: Burton, Paul
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An audio transducer device capable of acting as a full range speaker which achieves the propogation of a peaked wavefront from the diaphragm instead of generating a substantially planar wavefront as in the case of the common speaker construction utilizing a diaphragm driven as a piston. The speaker has a frame with a central open area in which is supported a substantially planar, thin, flexible film forming the diaphragm. The diaphragm is driven by a driver which imparts motion to the diaphragm at a small source area preferrably centrally disposed of the diaphragm, the motion being imparted in a direction normal to the plane of the diaphragm so that ripples radiate from the drive area and …
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
- Granted June 11, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 11, 2008.
- 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.