Loudspeaker and a method of producing the same
CA 1136261 A · Owner: Sony Corporation · Inventors: Osato, Mamoru; Koizumi, Hiroshi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A METHOD OF PRODUCING THE SAME ABSTRACT OF THE DISCLOSURE:, A loudspeaker comprises a diaphragm including first and second layers and a core member sandwiched between the layers, in which the core member has an edge or peripheral surface aslant relative to the direction of thickness thereof; and a drive assembly which includes, a voice coil wound around a voice coil bobbin and which is connected to a node portion of the diaphragm when vibrated in its divided vibration mode. A support structure supports the diaphragm and the drive assembly and includes a frame and an edge member secured to the frame, the edge member having a first portion corresponding to the slant of the edge surface of the …
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 November 23, 1982. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 23, 1999.
- 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.