3757857

Information

• Patent Grant
• 3757857

• References
• Source

• Patent Number

  3,757,857

• Date Filed

  Not available

• Date Issued

  Tuesday, September 11, 1973
  51 years ago

• CPC

  • F28D1/0308 - the conduits being formed by paired plates touching each other
  • B21D53/08 - of both metal tubes and sheet metal
  • F28F21/003 - for domestic or space-heating systems

• US Classifications

  • 165 - Heat exchange