H03F1/54 - CPC Classification Index

ClassID:

219197 ⎘

H03F1/54 - CPC Classification

Classification description:

Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements; Circuit arrangements for protecting such amplifiers with tubes only

Sub-classes:

H03F1/542 » {Replacing by standby devices} 0
H03F1/544 » {Protection of filaments} 0
H03F1/546 » {Delaying application of anode power supply with respect to application of filament heating power supply} 0
H03F1/548 » {Protection of anode or grid circuit against overload} 2

Recent Application in this class:

20220385243

2022-12-01

Real-time and adaptive radio-frequency power protection

20210152136

2021-05-20

Real-time and adaptive radio-frequency power protection

20190356279

2019-11-21

Real-time and adaptive radio-frequency power protection

20170141745

2017-05-18

Energy supply unit for a traveling wave tube

20090212857

2009-08-27

DC self-biased vacuum tube differential amplifier with grid-to-cathode over-voltage protection