2257640

Information

• Patent Grant
• 2257640

• References
• Source

• Patent Number

  2,257,640

• Date Filed

  Not available

• Date Issued

  Tuesday, September 30, 1941
  83 years ago

• CPC

  • E01B9/08 - Elastic spikes

• US Classifications

  • 238 - Railways: surface track
  • 411 - Expanded, threaded, driven, headed, tool-deformed, or locked-threaded fastener