IPC Subgroup
H03J 9/04 using ultrasonic, sonic or infrasonic waves
Introduced: January 1980
Last revised: January 2006
Full Title
Remote-control of tuned circuits; Combined remote-control of tuning and other functions, e.g. brightness, amplification > using ultrasonic, sonic or infrasonic waves
Classification Context
- Section:
- ELECTRICITY
- Class:
- ELECTRONIC CIRCUITRY
- Subclass:
- TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS