Lead-frame for an electret microphone
CA 1210495 A · Owner: Telefonaktiebolaget Lm Ericsson · Inventors: Malmkvist, Hans G.; Madsen, Henning S.; Aksberg, Arvi J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A lead frame for an electret microphone consists of thin metallic material shaped with two continuous rectangular plates. One forms the base plate for an amplifying unit included in the electret microphone and the other forms the rear electrode of the electret microphone. One or more leads are included in the frame and connected to one of the plates.
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 August 26, 1986. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended August 26, 2003.
- 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.