3842703

Information

• Patent Grant
• 3842703

• References
• Source

• Patent Number

  3,842,703

• Date Filed

  Not available

• Date Issued

  Tuesday, October 22, 1974
  50 years ago

• CPC

  • G10H1/0553 - using optical or light-responsive means
  • G10H2220/305 - using a light beam to detect key, pedal or note actuation
  • Y10S84/19 - Light sensitive resistor

• US Classifications

  • 084 - Music
  • 330 - Amplifiers
  • 340 - Communications: electrical
  • 984 - Musical instruments