Patents by Inventor Leif Ampler

Leif Ampler 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 measuring and controlling the volumetric weight of an expanded particulate material
    Patent number: 4852028
    Abstract: Raw material to be expanded is supplied to an expansion chamber (12). The volumetric weight (M) and the moisture content (F) of the expanded material is measured, and signals representing the measured values obtained, are supplied to a microcomputer (27). This is programmed for comparing the volumetric weight as measured with a nominal value of the volumetric weight at the prevailing moisture content of the expanded material and is adapted to supply in dependence of the comparison made a signal for controlling the screw conveyor and drive unit (11, 13) for the supply of raw material to the expansion chamber to control the expansion of the material in dependence of the comparison by increasing or decreasing the amount of raw material supplied per unit of time.
    Type: Grant
    Filed: March 25, 1987
    Date of Patent: July 25, 1989
    Inventors: Heikki Korpela, Leif Ampler