,申请号NO19720004428-传众专利搜索

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法人/股东/高管

发明名称
摘要	The invention relates to a procedure for manufacture of an electret microphone comprising a fixed electrode and a movable electrode, the movable electrode comprising a first plastic film which is metallized and a second plastic film which is electro-statically polarized. According to the invention, there are a first processing stage in which the first and second plastic films are metallized and polarized respectively and a second processing stage in which the metallized plastic film, the polarized plastic film and the fixed electrode are assembled together.
申请公布号	NO132015(C)	申请公布日期	1975.09.03
申请号	NO19720004428	申请日期	1972.12.01
申请人	TELEFONAKTIEBOLAGET L M ERICSSON	发明人	HEDMAN J-O
分类号	H04R19/00;H01G7/02;H01L23/48;H04R19/01;H04R31/00;(IPC1-7):04R31/00	主分类号	H04R19/00
代理机构		代理人
主权项
地址

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