Patents by Inventor Leland A. Hardcastle

Leland A. Hardcastle 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).

  • Process for making porous graphite and articles produced therefrom
    Patent number: 6776936
    Abstract: A process for producing solid, porous graphites which provides a more uniform density gradient throughout the ultimate product. The process utilizes a pressure drop during processing in order to induce boiling and varies the processing pressure between an initial pressure which exceeds 1000 psig and a final processing pressure which generally exceeds the initial pressure. The particular processing techniques employed allow additional viscosity manipulation as well as improved density gradient characteristics in the ultimate product. The final products have bulk thermal conductivities in the range from 90-300 W/mK with apparent densities ranging from about 0.678 g/cc-1.
    Type: Grant
    Filed: August 9, 2001
    Date of Patent: August 17, 2004
    Assignee: Poco Graphite, Inc.
    Inventors: Leland A. Hardcastle, Rex G. Sheppard, David F. Dingus
  • Process for making carbon foam induced by process depressurization
    Patent number: 6576168
    Abstract: A process for producing molded pitch based foam is shown which provides a more uniform density gradient throughout the ultimate product. The process utilizes a pressure drop during processing in order to induce foaming. By inducing foaming through process depressurization, additional viscosity manipulation can be achieved as well as improved density gradient characteristics in the ultimate product.
    Type: Grant
    Filed: May 22, 2001
    Date of Patent: June 10, 2003
    Assignee: Poco Graphite, Inc.
    Inventors: Leland A. Hardcastle, Rex G. Sheppard, David F. Dingus
  • Process for making porous graphite and articles produced therefrom
    Publication number: 20030034575
    Abstract: A process for producing solid, porous graphites which provides a more uniform density gradient throughout the ultimate product. The process utilizes a pressure drop during processing in order to induce boiling and varies the processing pressure between an initial pressure which exceeds 1000 psig and a final processing pressure which generally exceeds the initial pressure. The particular processing techniques employed allow additional viscosity manipulation as well as improved density gradient characteristics in the ultimate product. The final products have bulk thermal conductivities in the range from 90-300 W/mK with apparent densities ranging from about 0.678 g/cc-1.
    Type: Application
    Filed: August 9, 2001
    Publication date: February 20, 2003
    Inventors: Leland A. Hardcastle, Rex G. Sheppard, David F. Dingus
  • Process for making carbon foam induced by process depressurization
    Publication number: 20020190414
    Abstract: A process for producing molded pitch based foam is shown which provides a more uniform density gradient throughout the ultimate product. The process utilizes a pressure drop during processing in order to induce foaming. By inducing foaming through process depressurization, additional viscosity manipulation can be achieved as well as improved density gradient characteristics in the ultimate product.
    Type: Application
    Filed: May 22, 2001
    Publication date: December 19, 2002
    Inventors: Leland A. Hardcastle, Rex G. Sheppard, David F. Dingus