Patents by Inventor Hellfried Karpe

Hellfried Karpe 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).

  • Apparatus for determining the flow of matter passing through a boundary surface
    Patent number: 5376336
    Abstract: An apparatus for determining the flow of matter passing through a boundary surface, which is provided with at least one sensing layer corresponding to the boundary surface, and presents a known or predetermined, finite resistance to the material flow, and wherein an optical indicator is provided in the sensing layer for obtaining a first measured value of a quantity dependent on the mean concentration of matter in the sensing layer, and wherein a second measured value of this quantity is known on one side of the sensing layer, or can be determined by means of another optical indicator provided in a second sensing layer, and, further, wherein an evaluation unit is provided for inferring the material flow from the difference of the two values measured.
    Type: Grant
    Filed: May 6, 1992
    Date of Patent: December 27, 1994
    Assignee: Medical Instruments AG
    Inventors: Dietrich W. Lubbers, Hellfried Karpe