3644031

Information

• Patent Grant
• 3644031

• References
• Source

• Patent Number

  3,644,031

• Date Filed

  Not available

• Date Issued

  Tuesday, February 22, 1972
  53 years ago

• CPC

  • G03B23/06 - with rotary movement
  • Y10T74/19237 - Internal-external gears

• US Classifications

  • 353 - Optics: image projectors
  • 074 - Machine element or mechanism