Patents by Inventor Dirk Hoffmeyer

Dirk Hoffmeyer 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).

  • Closed loop ionization apparatus for detecting trace gases
    Patent number: 5223712
    Abstract: A trace gas detector including in a closed gas loop, two baffle cells with an intermediate trace gas filter, each baffle cell consists of an ionization source, a labyrinth-like recombination zone and a collector electrode. A differential circuit derives a differential signal from output signals of the two baffle cells, the differential signal depending only on the trace gas concentration. Temperature changes and supply voltage changes are compensated by means of the differential circuit.
    Type: Grant
    Filed: July 19, 1991
    Date of Patent: June 29, 1993
    Assignee: Honeywell-Elac-Nautik GmbH
    Inventors: Horst Adams, Joerg Boscher, Dirk Hoffmeyer