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公开(公告)号:US2308795A
公开(公告)日:1943-01-19
申请号:US28094939
申请日:1939-06-24
Applicant: RCA CORP
Inventor: ROELOF VERMEULEN
IPC: G11B3/20
CPC classification number: G11B3/20
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2.Electrodynamic magnet system for microphones, loudspeakers, or similar devices 失效
Title translation: 用于麦克风,扬声器或类似设备的电动磁体系统公开(公告)号:US2006847A
公开(公告)日:1935-07-02
申请号:US25944528
申请日:1928-03-06
Applicant: RCA CORP
Inventor: ROELOF VERMEULEN , URK AREND THOMAS VAN
IPC: H04R9/04
CPC classification number: H04R9/045
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公开(公告)号:US1829203A
公开(公告)日:1931-10-27
申请号:US43321330
申请日:1930-03-05
Applicant: RCA CORP
Inventor: ROELOF VERMEULEN
IPC: H04R21/02
CPC classification number: H04R21/026
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4.Device for converting electric oscillations into mechanical vibrations 失效
Title translation: 将电振荡转换为机械振动的装置公开(公告)号:US1781795A
公开(公告)日:1930-11-18
申请号:US19243027
申请日:1927-05-18
Applicant: RCA CORP
Inventor: ROELOF VERMEULEN , URK AREND THOMAS VAN , HENDRICUS HERMANS THEODORUS
IPC: H04R11/00
CPC classification number: H04R11/00
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5.Magnet system for converting electric oscillations into acoustic ones or conversely 失效
Title translation: 用于将电振荡转换为声振荡的磁体系统或反之亦然公开(公告)号:US1876113A
公开(公告)日:1932-09-06
申请号:US29882728
申请日:1928-08-10
Applicant: RCA CORP
Inventor: ROELOF VERMEULEN
IPC: H04R11/00
CPC classification number: H04R11/00
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7.Device to convert mechanical vibrations into electrical oscillations 失效
Title translation: 将机械振动转换为电气振荡的装置公开(公告)号:US2240918A
公开(公告)日:1941-05-06
申请号:US21460838
申请日:1938-06-18
Applicant: RCA CORP
Inventor: ROELOF VERMEULEN , STEFANUS FUCHS HERMANUS
IPC: H04R9/12
CPC classification number: H04R9/12
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公开(公告)号:US2015169A
公开(公告)日:1935-09-24
申请号:US42332430
申请日:1930-01-25
Applicant: RCA CORP
Inventor: ROELOF VERMEULEN
IPC: H04R21/02
CPC classification number: H04R21/021
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公开(公告)号:US1947749A
公开(公告)日:1934-02-20
申请号:US34415829
申请日:1929-03-05
Applicant: RCA CORP
Inventor: ROELOF VERMEULEN , YAN URK AREND THOMAS , CORNELIS LOMAN
IPC: H04R7/12
CPC classification number: H04R7/122
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10.Device for converting electric oscillations into mechanical vibrations 失效
Title translation: 将电振荡转换为机械振动的装置公开(公告)号:US1820943A
公开(公告)日:1931-09-01
申请号:US24057127
申请日:1927-12-16
Applicant: RCA CORP
Inventor: GILLES HOLST , URK AREND THOMAS VAN , ROELOF VERMEULEN
IPC: H04R11/00
CPC classification number: H04R11/00
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