Four pipe heat pump apparatus

• US 3,378,062 A
• Filed: 10/27/1966
• Issued: 04/16/1968
• Est. Priority Date: 10/27/1966
• Status: Expired due to Term

• Current Assignee: American Standard Inc. (Trane Technologies plc)
• Original Assignee: Clarence L. Ringquist, John W. Lorenz
• Inventors: Ringquist, Clarence L., Lorenz, John W.
• Application Number:
  US04/589,968
• Time in Patent Office: 537 Days
• US Class Current: 165/221
• CPC Class Codes: F24F 3/08 with separate supply and return lines for hot and cold heat-exchange fluids i.e. so-called "4-conduit" system
• CPC Class Codes: F25B 29/003 of the compression type system

Claims