Patents by Inventor John W. Ewer

John W. Ewer has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Air conditioning system having timed oil drain separator
    Patent number: 5199271
    Abstract: An air conditioning system (10) for an aircraft, the air conditioning system (10) having a separator (14) located between the high pressure side of a compressor (12) and a condenser (18). A timer (34) activated normally open solenoid (32) is located on a separator drain line 28 to periodically dump the lubricant accumulated in the separator (14) back into the compressor (12).
    Type: Grant
    Filed: January 24, 1991
    Date of Patent: April 6, 1993
    Assignee: Zee Systems, Inc.
    Inventor: John W. Ewer