3588352

Information

• Patent Grant
• 3588352

• References
• Source

• Patent Number

  3,588,352

• Date Filed

  Not available

• Date Issued

  Monday, June 28, 1971
  53 years ago

• CPC

  • H04M1/60 - including speech amplifiers
  • H04M9/08 - Two-way loud-speaking telephone systems with means for suppressing echoes or otherwise conditioning for one or other direction of traffic
  • H04M9/087 - using different frequency bands for transmitting and receiving paths ; using phase shifting arrangements
  • H04M9/10 - with switching of direction of transmission by voice frequency

• US Classifications

  • 379 - Telephonic communications