Patents by Inventor Claude J. Jacob

Claude J. Jacob 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).

  • Synthesis of wollastonite from natural materials without fusion
    Patent number: 3966884
    Abstract: The present invention relates to a process for the synthesis of crystallized wollastonite from a natural material having a high content of calcium carbonate and silica.According to the invention, silica or calcium carbonate are added to the natural material so that the mixture has a silica/carbonate content which varies less than 10% from the value of the stoichiometric ratio, the silica being introduced preferably in the form of crystallized silica having a large surface area, for example, kieselguhr. Crystallized CaSiO.sub.3 is obtained between 1000.degree.C and 1100.degree.C and high-temperature wollastonite, preferably between 1100.degree. and 1200.degree.C, according to the reaction: ##EQU1## The present invention may be used to produce wollastonite intended in particular for use in road surfaces and for the charging materials required in the rubber and plastics industry.
    Type: Grant
    Filed: June 20, 1974
    Date of Patent: June 29, 1976
    Assignee: Bureau de Recherches Geologiques et Minieres
    Inventor: Claude J. Jacob