2423320

Information

• Patent Grant
• 2423320

• References
• Source

• Patent Number

  2,423,320

• Date Filed

  Not available

• Date Issued

  Tuesday, July 1, 1947
  77 years ago

• CPC

  • A61F9/062 - with movable polarising filter discs

• US Classifications

  • 002 - Apparel
  • 250 - Radiant energy
  • 318 - Electricity: motive power systems
  • 359 - Optical: systems and elements