Patents Assigned to Charbonnages de France
  • Device for effecting translational movement of a machine
    Patent number: 3990349
    Abstract: A hauling device, for example for a mining machine, has two clamping elements which grip on ramps each of which elements is attached to an operating rod of a hauling jack. The jacks are operated alternately, in conjunction with the clamping elements to advance or retract the machine, and the hauling jacks are hydraulically interconnected in a manner to avoid hunting.
    Type: Grant
    Filed: April 1, 1975
    Date of Patent: November 9, 1976
    Assignee: Charbonnages de France
    Inventor: Alfred A. M. Valantin
  • Apparatus for the manufacture of light granulates
    Patent number: 3979168
    Abstract: An expanded granular material, particularly intended as a lightweight aggregate for concrete, is produced by melting a finely ground fusible silico-aluminous material, such as fly ash, in the presence of a controlled atmosphere intended to inhibit the liberation of gases coming from the silico-aluminous material, and then forming the melt into drops and cooling under conditions to permit gases to escape from the material thereby causing is expansion.
    Type: Grant
    Filed: February 11, 1975
    Date of Patent: September 7, 1976
    Assignees: Charbonnages de France, Houilleres du Bassin du Nord et du Pasde-Calais
    Inventor: Raymond Chauvin
  • Process for production of carbon fibers and the resultant fibers
    Patent number: 3966887
    Abstract: A process for the production of carbon fibers from coal-tar pitch or from other strongly aromatic distillation residues wherein an oxygen-containing polymer is added to the starting material before or during the heat treatment which is followed by the usual stages of spinning, oxidizing and carbonizing.
    Type: Grant
    Filed: October 26, 1972
    Date of Patent: June 29, 1976
    Assignee: Charbonnages de France
    Inventor: Pierre Chiche
  • Electric device for numerical measurement of a magnitude by a pulse counter
    Patent number: 3943338
    Abstract: An electronic counting device for displaying the measurement of a quantity includes a pulse counter which receives a supplementary pulse every time the pulse counter stands at any one of a predetermined series of numerals. The natural counting base of the counter is thus effectively modified so that the displayed output is determined according to a different counting base.
    Type: Grant
    Filed: September 12, 1972
    Date of Patent: March 9, 1976
    Assignee: Charbonnages de France
    Inventor: Claude Gagniere