3697954

Information

• Patent Grant
• 3697954

• References
• Source

• Patent Number

  3,697,954

• Date Filed

  Not available

• Date Issued

  Tuesday, October 10, 1972
  52 years ago

• CPC

  • H04Q3/0012 - in which the relays are arranged in a matrix configuration
  • G06C7/02 - Keyboards
  • H03K5/15093 - using devices arranged in a shift register
  • H03K23/84 - using thyristors or unijunction transistors

• US Classifications

  • 340 - Communications: electrical
  • 361 - Electricity: electrical systems and devices