1991970

Information

• Patent Grant
• 1991970

• References
• Source

• Patent Number

  1,991,970

• Date Filed

  Not available

• Date Issued

  Tuesday, February 19, 1935
  90 years ago

• CPC

  • H03C1/34 - by means of light-sensitive element

• US Classifications

  • 332 - Modulators
  • 250 - Radiant energy
  • 331 - Oscillators
  • 348 - Television
  • 358 - Facsimile and static presentation processing