1720744

Information

• Patent Grant
• 1720744

• References
• Source

• Patent Number

  1,720,744

• Date Filed

  Not available

• Date Issued

  Tuesday, July 16, 1929
  95 years ago

• CPC

  • G03B9/52 - Barrel shutters
  • G03B21/32 - Details specially adapted for motion-picture projection

• US Classifications

  • 352 - Optics: motion pictures