3808831

Information

• Patent Grant
• 3808831

• References
• Source

• Patent Number

  3,808,831

• Date Filed

  Not available

• Date Issued

  Tuesday, May 7, 1974
  51 years ago

• CPC

  • E01C13/102 - Civil engineering aspects of the construction of ice rinks or sledge runs made from frozen-liquid, semi-liquid or frozen-pasty substances
  • E04H4/0025 - with inflatable parts

• US Classifications

  • 062 - Refrigeration
  • 004 - Baths, closets, sinks, and spittoons
  • 441 - Buoys, rafts, and aquatic devices
  • 472 - Amusement devices