3639921

Information

• Patent Grant
• 3639921

• References
• Source

• Patent Number

  3,639,921

• Date Filed

  Not available

• Date Issued

  Tuesday, February 8, 1972
  53 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
  • E06C9/02 - rigidly mounted

• US Classifications

  • 004 - Baths, closets, sinks, and spittoons