Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB679843A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Philips Lamps Ltd
Koninklijke Philips NV
Original Assignee
Philips Lamps Ltd
Philips Gloeilampenfabrieken NV
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
567,889. Electric discharge apparatus. PHILIPS LAMPS, Ltd. (Naamlooze Vennootschap Philips' Gloeilampenfabrieken). April 29, 1943, No. 6798. [Class 39 (i)] To improve the mutual conductance of a valve having a cathode 1, a control grid 4 maintained at low voltage and an anode (not shown) exterior of the control grid, grids 2, 3 at a higher potential than the control grid and having turns aligned with each other and with those of the control grid are arranged between the latter and the cathode to focus the electrons so that they pass centrally between the turns of the control grid. Further grids may be arranged between the control grid and anode.
GB679843A1943-04-291943-04-29Improvements in or relating to devices comprising electric discharge tubes
ExpiredGB567889A
(en)