Patents by Inventor Hagen M Helm

Hagen M Helm 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).

  • Environmental control system
    Patent number: 6216981
    Abstract: An environmental control system which is particularly suitable for use in aircraft comprises an air compressor (22) and an expansion turbine (36). The air compressor (22) is electrically driven at its optimum speed to deliver compressed air to the turbine (36). The compressed air expands through the turbine (36), thereby reducing in temperature as it drives the turbine (36). An electrical generator (44) is driven by the turbine (36). A condenser (33) is provided to condense water vapor in the air exhausted from the compressor (22).
    Type: Grant
    Filed: February 9, 1999
    Date of Patent: April 17, 2001
    Assignee: Rolls-Royce plc
    Inventor: Hagen M Helm