3721491

Information

• Patent Grant
• 3721491

• References
• Source

• Patent Number

  3,721,491

• Date Filed

  Not available

• Date Issued

  Tuesday, March 20, 1973
  51 years ago

• CPC

  • G03D9/02 - using rupturable ampoules of liquid
  • G03B17/265 - specially adapted for motion picture film
  • G03D5/02 - using rupturable ampoules of liquid

• US Classifications

  • 352 - Optics: motion pictures
  • 242 - Winding, tensioning, or guiding