209420

Information

• Patent Grant
• 209420

• References
• Source

• Patent Number

  209,420

• Date Filed

  Not available

• Date Issued

  Tuesday, October 29, 1878
  146 years ago

• CPC

  • F28D7/024 - the conduits of only one medium being helically coiled tubes, the coils having a cylindrical configuration
  • Y10S165/441 - Helical

• US Classifications

  • 165 - Heat exchange