Patents by Inventor Richard Frank Hill

Richard Frank Hill 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 forming high density boron nitride and high density agglomerated boron nitride particles
    Patent number: 6048511
    Abstract: A method of forming pellets or agglomerates of high density boron nitride from high purity hexagonal boron nitride by crushing the high purity hexagonal boron nitride into boron nitride particles extending over a size range of at least 100 microns with the majority of the particles having a particle size above 50 microns and cold pressing the crushed particles into a compacted form. The compacted form is then granulated into a granulated powder and again cold pressed to form pellets or agglomerates of boron nitride particles with the operations of cold pressing and granulation occurring in one or more stages.
    Type: Grant
    Filed: January 5, 1999
    Date of Patent: April 11, 2000
    Assignee: Advanced Ceramics Corporation
    Inventors: Gregory W. Shaffer, Richard Frank Hill
  • High density agglomerated boron nitride particles
    Patent number: 5898009
    Abstract: A method of forming pellets or agglomerates of high density boron nitride from high purity hexagonal boron nitride by crushing the high purity hexagonal boron nitride into boron nitride particles extending over a size range of at least 100 microns with the majority of the particles having a particle size above 50 microns and cold pressing the crushed particles into a compacted form. The compacted form is then granulated into a granulated powder and again cold pressed to form pellets or agglomerates of boron nitride particles with the operations of cold pressing and granulation occurring in one or more stages.
    Type: Grant
    Filed: November 12, 1997
    Date of Patent: April 27, 1999
    Assignee: Advanced Ceramics Corporation
    Inventors: Gregory W. Shaffer, Richard Frank Hill
  • Enhanced boron nitride composition and polymer based high thermal conductivity molding compound
    Patent number: 5681883
    Abstract: The present invention relates to a boron nitride composition of particles of boron nitride and a nonionic surfactant for use as a filler with a distribution of agglomerates having an average particle size in the range of between 20-80 microns and to a molding compound having a high thermal conductivity of above at least 5 W/m.degree. K. The molding compound comprises a polymer base material, a filler and a nonionic surfactant with the filler comprising boron nitride in a concentration of at least 60% by weight of said composition and wherein the nonionic surfactant is selected from the class consisting of carboxylic acid amides and carboxylic acid esters.
    Type: Grant
    Filed: March 5, 1996
    Date of Patent: October 28, 1997
    Assignee: Advanced Ceramics Corporation
    Inventors: Richard Frank Hill, Stephen Phillip DaVanzo
  • Boron nitride seal and method of use
    Patent number: 5678832
    Abstract: Boron nitride formed to an optimum density and composition of soluble borates and oxygen forms a material which deforms under pressure and reforms to make a very low permeability seal. The boron nitride seal is formed by precompacting a boron nitride powder having a soluble borate concentration of between 0.5 and 1.90% by weight, hot pressing the powder to a density of about 1.85 g/cc and machining the hot pressed powder into a seal of desired shape.
    Type: Grant
    Filed: December 29, 1995
    Date of Patent: October 21, 1997
    Assignee: Advanced Ceramics Corporation
    Inventor: Richard Frank Hill