3647976

Information

• Patent Grant
• 3647976

• References
• Source

• Patent Number

  3,647,976

• Date Filed

  Not available

• Date Issued

  Tuesday, March 7, 1972
  52 years ago

• CPC

  • H04J3/00 - Time-division multiplex systems
  • H04B3/38 - for signals in two different frequency ranges transmitted in opposite directions over the same transmission path
  • H04B14/02 - characterised by the use of pulse modulation
  • H04J3/08 - Intermediate station arrangements
  • H04J3/1676 - Time-division multiplex with pulse-position, pulse-interval, or pulse-width modulation
  • H04M9/022 - Multiplex systems
  • H04N7/10 - Adaptations for transmission by electric cable
  • H04N7/16 - Analogue secrecy systems Analogue subscription systems

• US Classifications

  • 370 - Multiplex communications
  • 332 - Modulators
  • 348 - Television