Patents by Inventor Anita O. Sy

Anita O. Sy 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).

  • High temperature dispersant
    Patent number: 4476029
    Abstract: Improved dispersants are disclosed for water-based bentonite clay drilling fluids containing a waterloss controller and a weighting agent. The dispersant can be a polyacrylic acid having a molecular weight of from about 700 to about 50,000 and preferably about 4,000 to about 8,000 or it can be used in combination with a sulfonated polystyrene-maleic anhydride copolymer. The dispersants are able to be used at temperatures from about 70.degree. F. up to 500.degree. F.
    Type: Grant
    Filed: May 26, 1982
    Date of Patent: October 9, 1984
    Assignees: W. R. Grace & Co., Dearborn Chemical Co.
    Inventors: Anita O. Sy, Dionisio G. Cuisia
  • Conversion of amides to isocyanates via phase transfer catalysis
    Patent number: 4282167
    Abstract: The present invention is a method of subjecting amides to a modified Hofmann reaction using a 2-phase aqueous/organic system. The Hofmann reaction is modified in the sense that the product is an organic isocyanate rather than an amine. Generally, the reaction employs a phase transfer catalyst although, for tertiary amides it has been discovered that use of the catalyst is not required.
    Type: Grant
    Filed: January 16, 1980
    Date of Patent: August 4, 1981
    Assignee: W. R. Grace & Co.
    Inventors: Anita O. Sy, Joseph W. Raksis