Patents by Inventor John-David Murphy

John-David Murphy 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).

  • Method for recycling fine calcium fluoride powder
    Patent number: 6723139
    Abstract: Process for recycling a composition comprising pulverulent calcium fluoride in the form of micrometric particles comprising: (i) a stage of mixing, in the presence of water, the said composition with pulverulent calcium fluoride (also known as natural spar), the particle size of which is suitable for feeding an HF furnace, in a ratio r of less than 75% by weight, preferably of less than 30%, then (ii) a stage of drying the mixture resulting from (i) until a residual water content is obtained which is also suitable for feeding an HF furnace; the stage (ii) optionally being carried out simultaneously with the stage (i).
    Type: Grant
    Filed: October 25, 2001
    Date of Patent: April 20, 2004
    Assignee: Atofina
    Inventors: Jean-Marc Biragnet, John-David Murphy, Henri Kouache