Patents by Inventor Daniel Urffer

Daniel Urffer 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).

  • Propping agent based on zirconia and silica for deep geological fractures
    Patent number: 4607697
    Abstract: The invention relates to a granular propping for use in petroleum extraction which has a high mechanical resistance and a density of between 3150 and 3250 kg/m.sup.3, the propping agent consisting of balls formed by melting, granulating and solidifying an initial composition comprising by weight, on the basis of the oxides, 47.1 to 48.7 parts of ZrO.sub.2, 52.9 to 51.3 parts of SiO.sub.2, the total of ZrO.sub.2 +SiO.sub.2 amounting to 100 parts, 8.2 to 16.9 parts of Al.sub.2 O.sub.3 and 4.1 to 8.5 parts of at least one oxide selected from the group formed by MgO, CaO, FeO and TiO.sub.2.
    Type: Grant
    Filed: August 6, 1985
    Date of Patent: August 26, 1986
    Assignee: Societe Europeenne des Produits Refractaires
    Inventor: Daniel Urffer