Patents by Inventor Jean-Pierre Kerherve

Jean-Pierre Kerherve 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).

  • Coating composition for the protection of metal against corrosion
    Patent number: 5681378
    Abstract: An aqueous composition for the protection of metal surfaces against corrosion includes, as an emulsion in water at least one overbased compound which is a water-insoluble salt. The overbased compound has a basic neutralization number of more than 40. In addition to the overbased compound, the aqueous composition also includes at least one surfactant constituted by an ammonium salt of an organic acid.
    Type: Grant
    Filed: September 6, 1996
    Date of Patent: October 28, 1997
    Assignee: Produtis Chimiques Auxiliares et de Synthese (P.C.A.S.)
    Inventor: Jean-Pierre Kerherve
  • Alkali free and alkaline earth free dibutyl tin difluoride powder
    Patent number: 4965383
    Abstract: A method for preparing dibutyl tin difluoride which comprises reacting dibutyl tin chloride and ammonium difluoride to form dibutyl tin difluoride; dissolving the dibutyl tin difluoride in an appropriate solvent to form a solution; adding a refractory powder having a predetermined particle size to the solution to act as a recrystallization initiator; rapidly cooling the solution to recrystallize the dibutyl tin difluoride; washing the recrystallized dibutyl tin difluoride at least once with a suitable solvent; and recovering a final dibutyl tin difluoride product having spherical grains averaging 15-25 microns in size which are free of alkaline-earth and alkali impurities. The products produced by this process.
    Type: Grant
    Filed: March 5, 1987
    Date of Patent: October 23, 1990
    Assignee: Saint-Gobain Vitrage
    Inventors: Jean-Pierre Kerherve, Armel Queromes
  • Method for forming a coated substrate
    Patent number: 4812332
    Abstract: A method for preparing dibutyl tin difluoride which comprises reacting dibutyl tin chloride and ammonium fluoride to form dibutyl tin difluoride; dissolving the dibutyl tin difluoride in an appropriate solvent to form a solution; adding a refractory powder having a predetermined particle size to the solution to act as a recrystallization initiator; rapidly cooling the solution to recrystallize the dibutyl tin difluoride; washing the recrystallized dibutyl tin difluoride at least once with a suitable solvent; and recovering a final dibutyl tin difluoride product having spherical grains averaging 15-25 microns in size which are free of alkaline-earth and alkali impurities. The products produced by this process.
    Type: Grant
    Filed: July 27, 1987
    Date of Patent: March 14, 1989
    Inventors: Jean-Pierre Kerherve, Armel Queromes
  • Method for preparing a dibutyl tin difluoride powder for coating a substrate
    Patent number: 4694091
    Abstract: A method for preparing dibutyl tin difluoride which comprises reacting dibutyl tin chloride and ammonium difluoride to form dibutyl tin difluoride; dissolving the dibutyl tin difluoride in an appropriate solvent to form a solution; adding a refractory powder having a predetermined particle size to the solution to act as a recrystallization initiator; rapidly cooling the solution to recrystallize the dibutyl tin difluoride; washing the recrystallized dibutyl tin difluoride at least once with a suitable solvent; and recovering a final dibutyl tin difluoride product having spherical grains averaging 15-25 microns in size which are free of alkaline-earth and alkali impurities. The products produced by this process.
    Type: Grant
    Filed: August 14, 1985
    Date of Patent: September 15, 1987
    Assignee: Saint Gobain Vitrage
    Inventors: Jean-Pierre Kerherve, Armel Queromes