Patents by Inventor Robert B. DeWolf, II

Robert B. DeWolf, II 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).

  • Methods of preparing hydrous silica gels
    Patent number: 4474824
    Abstract: Dentifrice compositions containing a hydrous silica gel having a water content of from about 20 to about 60 weight percent are disclosed. The abrasiveness of the gel is increased by contacting the gel with an alkaline medium to provide a gel pH of about 6 to about 10 and/or preparing the gel by drying and grinding a silica hydrogel that has been washed with an aqueous acidic solution having a temperature of from about 80.degree. to about 100.degree. F.
    Type: Grant
    Filed: February 15, 1980
    Date of Patent: October 2, 1984
    Assignee: W. R. Grace & Co.
    Inventors: Robert B. DeWolf, II, Rimantas Glemza
  • Hydrous silica gel containing dentifrice
    Patent number: 4303641
    Abstract: Dentifrice compositions containing a hydrous silica gel having a water content of from about 20 to about 60 weight percent are disclosed. The abrasiveness of the gel is increased by contacting the gel with an alkaline medium to provide a gel pH of about 6 to about 10 and/or preparing the gel by drying and grinding a silica hydrogel that has been washed with an aqueous acidic solution having a temperature of from about 80.degree. to about 100.degree. F.
    Type: Grant
    Filed: May 24, 1978
    Date of Patent: December 1, 1981
    Assignee: W. R. Grace & Co.
    Inventors: Robert B. DeWolf, II, Rimantas Glemza