Patents by Inventor Pierre Duchadeau

Pierre Duchadeau 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).

  • Devices which comprise a helical spring used as conveying, extracting, quantity-controlling or mixing means
    Patent number: 4496086
    Abstract: A rotating helical coiled spring for conveying, extracting, quantity-controlling or mixing particulate products. A supple material such as a brush is attached to the periphery of the spring and brushes against a rigid wall or tube as the spring is rotated thereby propelling the particulate product in a direction generally parallel to the axis of the spring.
    Type: Grant
    Filed: May 5, 1982
    Date of Patent: January 29, 1985
    Assignee: Pari-Symac
    Inventor: Pierre Duchadeau