2161742

Information

• Patent Grant
• 2161742

• References
• Source

• Patent Number

  2,161,742

• Date Filed

  Not available

• Date Issued

  Tuesday, June 6, 1939
  85 years ago

• CPC

  • C21D9/26 - for needles for teeth for card-clothing
  • B21G1/006 - Special treatments of pins or needles
  • C21D1/63 - for bath quenching

• US Classifications

  • 148 - Metal treatment
  • 266 - Metallurgical apparatus
  • 432 - Heating