3522988

Information

• Patent Grant
• 3522988

• References
• Source

• Patent Number

  3,522,988

• Date Filed

  Not available

• Date Issued

  Tuesday, August 4, 1970
  54 years ago

• CPC

  • G07F17/163 - for film projection apparatus
  • Y10S40/906 - Sound

• US Classifications

  • 352 - Optics: motion pictures
  • 040 - Card, picture, or sign exhibiting