Patents by Inventor James Hansell Adair

James Hansell Adair 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).

  • Method for controlling the size and morphology of alpha-alumina particles
    Patent number: 5759213
    Abstract: A method for producing phase-pure, monodispersed, single crystal alpha-alumina particles of controlled size and shape comprises the steps of providing an aluminum hydrous oxide precursor and a glycol solution, dispersing said precursor in said glycol solution to create a suspension, heating and stirring said suspension in a closed pressure vessel to produce alpha-alumina particles, cooling said suspension, and removing said alpha-alumina particles from said solution. Additionally nucleation seeds may be added to the solution. Control of size is a function of seeding concentration, and control of morphology is a function of stirring rate.
    Type: Grant
    Filed: December 30, 1996
    Date of Patent: June 2, 1998
    Assignee: University of Florida
    Inventors: James Hansell Adair, Sridhar Venigalla, Seung-Beom Cho