Patents by Inventor Franz Doubrawa

Franz Doubrawa 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).

  • Process for purifying exhaust air from plant parts of oil mills
    Patent number: 5259868
    Abstract: The present invention pertains to a process for purifying the exhaust air from plant parts of oil mills, in which the exhaust air removed from the plant is returned, after part of it had been discharged, into the plant in a cycle.
    Type: Grant
    Filed: December 4, 1992
    Date of Patent: November 9, 1993
    Assignee: Radex-Heraklith Industriebeteiligungs Aktiengesellschaft
    Inventors: Franz Doubrawa, Martin Joksch