3351715

Information

• Patent Grant
• 3351715

• References
• Source

• Patent Number

  3,351,715

• Date Filed

  Not available

• Date Issued

  Tuesday, November 7, 1967
  57 years ago

• CPC

  • H04M1/50 - by generating or selecting currents of predetermined frequencies or combinations of frequencies
  • H03B5/1203 - the amplifier being a single transistor
  • H03B5/1231 - the amplifier comprising one or more bipolar transistors
  • H03B5/1281 - the parameter being the amount of feedback
  • H03B5/1296 - the feedback circuit comprising a transformer
  • H03B2200/0052 - including measures to switch the feedback circuit

• US Classifications

  • 331 - Oscillators
  • 379 - Telephonic communications