Patent search ap:("PHILIPS CORP") AND inv:"ROBERTO LEVI" Page 2

11.

发明授权
Thermionic cathode and method of manufacturing same 失效
Title translation: 热阴极及其制造方法

公开(公告)号：US2700000A

公开(公告)日：1955-01-18

申请号：US27360752

申请日：1952-02-27

Applicant: PHILIPS CORP

Inventor： ROBERTO LEVI , HUGHES RAY C

IPC: H01J1/14 , H01J1/28 , H01J9/04

CPC classification number: H01J9/047 , H01J1/14 , H01J1/28

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