3757830

Information

• Patent Grant
• 3757830

• References
• Source

• Patent Number

  3,757,830

• Date Filed

  Not available

• Date Issued

  Tuesday, September 11, 1973
  51 years ago

• CPC

  • F24F13/0245 - Manufacturing or assembly of air ducts; Methods therefor
  • B21D5/12 - making use of forming-rollers
  • B21D39/02 - of sheet metal by folding
  • B21D39/026 - Reinforcing the connection by locally deforming

• US Classifications

  • 138 - Pipes and tubular conduits