Patents by Inventor Helmut Struth

Helmut Struth 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).

  • Charging valve
    Patent number: 4798226
    Abstract: A charging valve consisting of a valve sleeve and a valve stem fixed in the interior thereof comprises a valve which acts by compression and tension, the tension or compression being exerted by resilient parts of the valve stem adjacent to both valves.
    Type: Grant
    Filed: February 11, 1988
    Date of Patent: January 17, 1989
    Assignee: Boehringer Ingelheim KG
    Inventor: Helmut Struth
  • Device and process for drawing off very small quantities of powder
    Patent number: 4350049
    Abstract: The invention is directed to an apparatus for drawing off powder in metered quantities of from about 0.5 to 10 mg, comprising a tubular member having a dosing chamber at one end, the chamber having walls consisting of porous material and the outer end of the chamber walls being air-tight, and being provided at the other end with a means for connecting the tubular member to vacuum and/or compressed air sources. The invention is also directed to a method of using such an apparatus.
    Type: Grant
    Filed: November 5, 1980
    Date of Patent: September 21, 1982
    Assignee: Boehringer Ingelheim GmbH
    Inventors: Arun R. Gupte, Heinrich Kladders, Helmut Struth