Patents by Inventor Wilfried Hecken

Wilfried Hecken 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).

  • Method and apparatus for controlling the liquid level above a solid bed
    Patent number: 4073310
    Abstract: There is described a process and apparatus which compares the pressure at the interface between the upper surface of a granular bed and the liquid in which it is submerged with the pressure above the liquid to maintain a predetermined head of liquid above the bed irrespective of expansion and contraction of the bed.
    Type: Grant
    Filed: September 2, 1975
    Date of Patent: February 14, 1978
    Assignee: Industrial Filter & Pump Mfg. Co.
    Inventors: Jiri Mikule, Wilfried Hecken