2172775

Information

• Patent Grant
• 2172775

• References
• Source

• Patent Number

  2,172,775

• Date Filed

  Not available

• Date Issued

  Tuesday, September 12, 1939
  85 years ago

• CPC

  • H01J29/89 - Optical or photographic arrangements structurally combined or co-operating with the vessel
  • H01J29/86 - Vessels Containers Vacuum locks
  • H04N5/74 - Projection arrangements for image reproduction
  • H01J2229/8907 - Image projection devices

• US Classifications

  • 348 - Television
  • 250 - Radiant energy
  • 313 - Electric lamp and discharge devices
  • 359 - Optical: systems and elements