2173505

Information

• Patent Grant
• 2173505

• References
• Source

• Patent Number

  2,173,505

• Date Filed

  Not available

• Date Issued

  Tuesday, September 19, 1939
  85 years ago

• CPC

  • G03B17/24 - with means for separately producing marks on the film
  • G03B2217/242 - Details of the marking device
  • G03B2217/246 - Details of the markings

• US Classifications

  • 430 - Radiation imagery chemistry: process, composition, or product thereof
  • 116 - Signals and indicators
  • 396 - Photography