3734140

Information

• Patent Grant
• 3734140

• References
• Source

• Patent Number

  3,734,140

• Date Filed

  Not available

• Date Issued

  Tuesday, May 22, 1973
  51 years ago

• CPC

  • B21C37/207 - with helical guides
  • F16L9/02 - of metal
  • F22B37/103 - Internally ribbed tubes
  • F22B37/12 - Forms of water tubes
  • F28F1/40 - the means being only inside the tubular element

• US Classifications

  • 138 - Pipes and tubular conduits