Patents by Inventor Elizabeth B. Weberg

Elizabeth B. Weberg 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: 5318888
    Abstract: An improvement in tabular grain manufacture is provided wherein large tabular grains can be prepared in less time and with a narrower size distribution than available in the art. The improved process includes the steps of:a) forming a nucleation solution by adding aqueous soluble silver salt to a vessel containing 0.08 to 0.25 molar aqueous soluble halide salt in an aqueous medium;b) adding a solution of ammoniacal base to said nucleation solution when 0.30 to 9.0% of said soluble silver salt has been added;c) optionally ripening said nucleation solution for up to 60 minutes;d) adding said soluble silver salt to said nucleation solution preferrably at an increasing rate to obtain growth pBr of 1.3 to 2.3;e) adding said soluble silver salt and said soluble halide salt to grow said tabular grains.
    Type: Grant
    Filed: September 16, 1992
    Date of Patent: June 7, 1994
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Elizabeth B. Weberg, Clyde M. Huff, Jr., Dennis C. Capps