H - Electricity – 04 – R
Patent
H - Electricity
04
R
356/12, 349/67,
H04R 1/04 (2006.01) H04R 19/01 (2006.01)
Patent
CA 1107382
Abstract of the Disclosure A telephone electret microphone assembly has an electret clamped between a pair of printed circuit boards. The electret conducting surface and printed circuit patterns on the boards have an overlapping arrangement at a planar function. The arrangement connects a capacitor, of which the electret forms part, into an amplifying circuit. - i -
315771
Dolan Bruce I.
Dragunevicius Algirdas J.
Gumb Beverley W.
Morrell Ronald J.
Wojcik Jacek J.
Northern Telecom Limited
Wilkinson S.l.
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