631902

Information

• Patent Grant
• 631902

• References
• Source

• Patent Number

  631,902

• Date Filed

  Not available

• Date Issued

  Tuesday, August 29, 1899
  125 years ago

• CPC

  • B60H1/16 - the air being heated by direct contact with the plant

• US Classifications

  • 237 - Heating systems
  • 165 - Heat exchange