Horn speaker
CA 1164355 A · Owner: Matsushita Electric Industrial Co. Ltd. · Inventors: Mikami, Noboru; Yukiyoshi, Atsushi; Kawamura, Akihisa
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A horn speaker capable of forming a uniform sound field of a high fidelity and uniform tone quality and clearness, regardless of the position of listeners is suitable for use in broadcastings in a hall station, yard, playground and so forth. The horn speaker has a horn defined by four wall surfaces each defined by the equation:, a - ao (1 + .alpha.x)n where ao represents half the cross-sectional width of the respective wall surface at the throat a represents half the cross-sectional width of the respective wall surface at a distance x from the throat and .alpha. represents the divergence coefficient. n has a value n1 (n1 ? 2) at the open end side of the horn and a different value n2 (n2 > …
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 March 27, 1984. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 27, 2001.
- 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.