2254057

Information

• Patent Grant
• 2254057

• References
• Source

• Patent Number

  2,254,057

• Date Filed

  Not available

• Date Issued

  Tuesday, August 26, 1941
  83 years ago

• CPC

  • H04N5/72 - Modifying the appearance of television pictures by optical filters or diffusing screens
  • H01J29/89 - Optical or photographic arrangements structurally combined or co-operating with the vessel
  • H01J2229/8905 - Direction sensitive devices for controlled viewing angle

• US Classifications

  • 348 - Television
  • 313 - Electric lamp and discharge devices