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
GB39446/29A
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.)
Arcturus Radio Tube Co
Original Assignee
Arcturus Radio Tube Co
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.)
Filing date
Publication date
Application filed by Arcturus Radio Tube CofiledCriticalArcturus Radio Tube Co
Publication of GB344969ApublicationCriticalpatent/GB344969A/en
Measuring Pulse, Heart Rate, Blood Pressure Or Blood Flow
(AREA)
Electrotherapy Devices
(AREA)
Respiratory Apparatuses And Protective Means
(AREA)
Abstract
344,969. Thermionic valves. ARCTURUS RADIO TUBE CO., 260, Sherman Avenue, Newark, New Jersey, U.S.A.- (Assignees of Ruben, S. ; 801, Riverside Drive, New York, U.S.A.) Dec. 24, 1929, No. 39446. Convention date, Jan 5. [Class 39 (i).] A valve has a cathode 2, an anode 3, a control grid 4, and an auxiliary grid 5 of much smaller size and capacity than the control grid, but mounted on the same plane and axis. The auxiliary grid may be onetenth the size of the control grid, and is preferably connected so as to prevent feedback oscillations.
GB39446/29A1929-01-051929-12-24Improvements in or relating to vacuum tubes
ExpiredGB344969A
(en)