2820268

Information

• Patent Grant
• 2820268

• References
• Source

• Patent Number

  2,820,268

• Date Filed

  Not available

• Date Issued

  Tuesday, January 21, 1958
  67 years ago

• CPC

  • B22C9/126 - Hardening by freezing
  • B22C9/04 - Use of lost patterns

• US Classifications

  • 164 - Metal founding