Patent search ap:("VARIAN ASSOCIATES") AND inv:"HALL LEWIS D" Page 1

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发明授权
Electrical vacuum pump apparatus and method 失效
Title translation: 电动真空泵装置及方法

公开(公告)号：US2993638A

公开(公告)日：1961-07-25

申请号：US67381657

申请日：1957-07-24

Applicant: VARIAN ASSOCIATES

Inventor： HALL LEWIS D , HELMER JOHN C , JEPSEN ROBERT L

IPC: H01J41/06 , H01J41/20

CPC classification number: H01J41/20 , H01J41/06

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