3140540

Information

• Patent Grant
• 3140540

• References
• Source

• Patent Number

  3,140,540

• Date Filed

  Not available

• Date Issued

  Tuesday, July 14, 1964
  62 years ago

• CPC

  • B21D39/063 - for assembling ladders
  • E06C7/08 - Special construction of longitudinal members, or rungs or other treads
  • Y10T29/4992 - by flaring inserted cup or tube end
  • Y10T29/4994 - Radially expanding internal tube

• US Classifications

  • 029 - Metal working