2227037

Information

• Patent Grant
• 2227037

• References
• Source

• Patent Number

  2,227,037

• Date Filed

  Not available

• Date Issued

  Tuesday, December 31, 1940
  84 years ago

• CPC

  • H03K4/88 - using as active elements electrochemical cells or galvano-magnetic or photo-electric elements
  • H04N17/045 - Self-contained testing apparatus

• US Classifications

  • 250 - Radiant energy
  • 348 - Television