Patents by Inventor John P. Heffer

John P. Heffer 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).

  • Process for preparing platinum group metal catalysts
    Patent number: 4324700
    Abstract: Process for preparing a catalyst which comprises precipitating a catalytic metal hydroxide or hydrated oxide from a solution of a water soluble salt of the metal; collecting the precipitate and redispersing it in water; passing sulphur dioxide gas through the dispersion to dissolve the solid hydroxide or hydrated oxide; contacting a solid support with the resulting solution; drying and firing the solid.
    Type: Grant
    Filed: November 3, 1980
    Date of Patent: April 13, 1982
    Assignee: Johnson Matthey Public Limited Company
    Inventor: John P. Heffer