3490693

Information

• Patent Grant
• 3490693

• References
• Source

• Patent Number

  3,490,693

• Date Filed

  Not available

• Date Issued

  Tuesday, January 20, 1970
  55 years ago

• CPC

  • F24H9/2035 - for heaters using fluid combustibles
  • F23N1/085 - using electrical or electromechanical means
  • F23N1/087 - using mechanical means
  • F24D19/1006 - for water heating systems
  • F23N2035/14 - electromagnetically operated
  • F23N2035/18 - Groups of two or more valves
  • F23N2035/20 - Membrane valves
  • Y10S148/051 - Etching

• US Classifications

  • 237 - Heating systems
  • 148 - Metal treatment
  • 236 - Automatic temperature and humidity regulation