3140431

Information

• Patent Grant
• 3140431

• References
• Source

• Patent Number

  3,140,431

• Date Filed

  Not available

• Date Issued

  Tuesday, July 7, 1964
  60 years ago

• CPC

  • G08B5/30 - with rotating or oscillating members
  • G08B5/22 - using electric transmission using electro-magnetic transmission
  • H04M3/64 - Arrangements for signalling the number or class of the calling line to the operator

• US Classifications

  • 335 - Electricity: magnetically operated switches, magnets, and electromagnets
  • 340 - Communications: electrical