3797222

Information

• Patent Grant
• 3797222

• References
• Source

• Patent Number

  3,797,222

• Date Filed

  Not available

• Date Issued

  Tuesday, March 19, 1974
  51 years ago

• CPC

  • G04G9/0094 - using light valves
  • G04G9/025 - provided with date indication

• US Classifications

  • 368 - Horology: time measuring systems or devices
  • 040 - Card, picture, or sign exhibiting
  • 968 - Horology