Patent search ap:("PHILIPS LAB INC") AND inv:"GRACE FRANK E" Page 1

1.

发明授权
Electron switching tubes and circuits therefor 失效
Title translation: 电子开关管及其电路

公开(公告)号：US2588292A

公开(公告)日：1952-03-04

申请号：US15697250

申请日：1950-04-20

Applicant: PHILIPS LAB INC

Inventor： RITTNER EDMUND S , GRACE FRANK E , BEUTEL GEORGE A

IPC: H01J31/04 , H01L21/00 , H03B5/12 , H03C1/36 , H03F3/28 , H03F5/00

CPC classification number: H03F5/00 , H01J31/04 , H01L21/00 , H03C1/36 , H03F3/28 , Y10S313/07

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