2804548

Information

• Patent Grant
• 2804548

• References
• Source

• Patent Number

  2,804,548

• Date Filed

  Not available

• Date Issued

  Tuesday, August 27, 1957
  67 years ago

• CPC

  • H01J37/143 - Permanent magnetic lenses
  • H01J2893/0018 - Bar or cage-like grids

• US Classifications

  • 250 - Radiant energy
  • 313 - Electric lamp and discharge devices
  • 335 - Electricity: magnetically operated switches, magnets, and electromagnets