2177788

Information

• Patent Grant
• 2177788

• References
• Source

• Patent Number

  2,177,788

• Date Filed

  Not available

• Date Issued

  Tuesday, October 31, 1939
  85 years ago

• CPC

  • G03B17/24 - with means for separately producing marks on the film
  • G03B2217/245 - Mechanical devices
  • G03B2217/246 - Details of the markings

• US Classifications

  • 234 - Selective cutting
  • 352 - Optics: motion pictures
  • 369 - Dynamic information storage or retrieval
  • 396 - Photography