Patent search ap:("BELL TELEPHONE LABOR INC") AND inv:"CHEESMAN LEONARD E" Page 1

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发明授权
Secondary electron emitter 失效

公开(公告)号：US2530947A

公开(公告)日：1950-11-21

申请号：US8516249

申请日：1949-04-02

Applicant: BELL TELEPHONE LABOR INC

Inventor： CHEESMAN LEONARD E , MENDENHALL HALLAM E

IPC: H01J1/32 , H01J9/12

CPC classification number: H01J9/125 , H01J1/32 , H01J2201/32 , Y10T428/265

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