3137784

Information

• Patent Grant
• 3137784

• References
• Source

• Patent Number

  3,137,784

• Date Filed

  Not available

• Date Issued

  Tuesday, June 16, 1964
  60 years ago

• CPC

  • A61F9/062 - with movable polarising filter discs

• US Classifications

  • 219 - Electric heating
  • 002 - Apparel
  • 359 - Optical: systems and elements