Patent search ap:("BELL TELEPHONE LABOR INC") AND inv:"HUBERT HEFFNER" Page 1

1.

发明授权
Backward wave tube 失效

公开(公告)号：US2891191A

公开(公告)日：1959-06-16

申请号：US39294653

申请日：1953-11-18

Applicant: BELL TELEPHONE LABOR INC

Inventor： HUBERT HEFFNER , RUDOLF KOMPFNER

IPC: H01J25/36 , H01J25/40

CPC classification number: H01J25/36 , H01J25/40

Patent Agency Ranking