2928069

Information

• Patent Grant
• 2928069

• References
• Source

• Patent Number

  2,928,069

• Date Filed

  Not available

• Date Issued

  Tuesday, March 8, 1960
  64 years ago

• CPC

  • H04R17/04 - Gramophone pick-ups using a stylus Recorders using a stylus
  • B06B1/0655 - of cylindrical shape
  • G01P15/08 - with conversion into electric or magnetic values
  • G01P15/0885 - by magnetostrictive pick-up
  • G01P15/09 - by piezo-electric pick-up
  • H01H57/00 - Electrostrictive relays Piezo-electric relays
  • H03B5/34 - active element in amplifier being vacuum tube
  • H03H9/545 - including active elements
  • H03H9/562 - comprising a ceramic piezoelectric layer
  • H04R17/00 - Piezo-electric transducers Electrostrictive transducers

• US Classifications

  • 367 - Communications, electrical: acoustic wave systems and devices
  • 310 - Electrical generator or motor structure
  • 331 - Oscillators
  • 333 - Wave transmission lines and networks
  • 381 - Electrical audio signal processing systems and devices