Patents by Inventor Alfred Alphonse Marie Valantin

Alfred Alphonse Marie Valantin 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).

  • Roof support
    Patent number: 4114385
    Abstract: A roof support for use in mines is moved by its own drive mechanism while under permanent load. The support comprises two side-by-side lower carriages with articulated tracks, cross members joining those carriages and an arm articulated to the cross members so as to swing up and down under the action of a jack connected between the arm and the cross members. At least one upper carriage having an articulated track is carried on the upper end of the arm, and is pushed against the roof of a mine gallery by the jack.
    Type: Grant
    Filed: December 6, 1977
    Date of Patent: September 19, 1978
    Assignee: Charbonnages de France
    Inventor: Alfred Alphonse Marie Valantin