Patents by Inventor Fre/ de/ ric Walch

Fre/ de/ ric Walch 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).

  • Cylindrical chamber for liquid meter with oscillating piston
    Patent number: 5495756
    Abstract: A cylindrical chamber (1) for an oscillating piston type of liquid counter comprises notably a biconcave fixed partition wall (9) and grooves on the lower and/or upper edges of the piston and, as the case may be, on the small cylinders of the chamber 1. The disclosure can be applied to the metering of liquid and, especially, to the metering of water.
    Type: Grant
    Filed: June 1, 1994
    Date of Patent: March 5, 1996
    Assignee: Socie/ te/ Sappel
    Inventors: Thierry Robitaille, Fre/ de/ ric Walch