1978639

Information

• Patent Grant
• 1978639

• References
• Source

• Patent Number

  1,978,639

• Date Filed

  Not available

• Date Issued

  Tuesday, October 30, 1934
  90 years ago

• CPC

  • F28D7/08 - the conduits being otherwise bent
  • Y10S165/164 - Film flow constrained to spiral path

• US Classifications

  • 165 - Heat exchange