Patents by Inventor Robert Magrone

Robert Magrone 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).

  • Patent number: 4534957
    Abstract: Hydrargillite is converted into boehmite by preparing a suspension (A) of hydrargillite in water with a proportion from 150 g/l to 700 g/l of dry material expressed as Al.sub.2 O.sub.3, subjecting it to heat treatment under pressure (D) at a temperature of from C. to C., the speed of the rise in temperature of said suspension being at least C./minute, and causing it to pass a period of time of from 1 minute to 60 minutes in a holding zone (D) at a temperature in the range of from C. to C.The boehmite produced has a granulometry which is at most identical to that of the initial hydrargillite, and has a much lower content of alkaline material.
    Type: Grant
    Filed: May 9, 1983
    Date of Patent: August 13, 1985
    Inventors: Alain Lectard, Robert Magrone
  • Patent number: 4277289
    Abstract: A process for cleaning the walls of heat exchangers or reactors which are covered with essentially titaniferous incrustations but which can also contain silico-aluminous incrustations formed during the attack of ores and causing a considerable reduction in the heat exchange capacity, the said process being intended to restore the fundamental characteristics of the said walls, which is characterized in that the incrustations are removed by means of an aqueous treatment liquor containing from 3 to 30% by weight of hexafluosilicic acid and at most 10% by weight of hydrofluoric acid. The aqueous treatment liquor can contain a corrosion inhibitor and the treatment can be carried out at a temperature between C. and C.
    Type: Grant
    Filed: July 6, 1979
    Date of Patent: July 7, 1981
    Assignee: Aluminum Pechiney
    Inventors: Alain Lectard, Robert Magrone
  • Patent number: 4101629
    Abstract: Process for treating solutions from the Bayer process, enabling amounts of sodium carbonate and sodium oxalate or sodium salts of organic acids corresponding to the amounts of these compounds dissolved during the attack on a bauxite to be removed by means of a barium compound, and without consumption of the latter.
    Type: Grant
    Filed: October 20, 1976
    Date of Patent: July 18, 1978
    Assignee: Aluminium Pechiney
    Inventors: Henri Mercier, Robert Magrone, Jean Deabriges