Patents by Inventor Friedrich W. Schmitt

Friedrich W. Schmitt 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).

  • Diaphragm valves and valve systems
    Patent number: 4274452
    Abstract: A diaphragm valve housing has a flexible diaphragm positioned to permit access of at least two of three channels passing within said valve housing to one side of said diaphragm, through channel ports, to allow fluid flow between the channels. A control vent opens to a second side of said diaphragm to allow a control fluid to press said diaphragm against a sealing surface to seal said channels from one another. The valve construction can be used in various combinations with other like valve constructions having more or fewer channels therein.
    Type: Grant
    Filed: December 26, 1978
    Date of Patent: June 23, 1981
    Assignee: Robert J. Albert
    Inventor: Friedrich W. Schmitt