Patents by Inventor Ronald Partridge

Ronald Partridge 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 forming multi-layer molded articles
    Patent number: 8029718
    Abstract: The invention relates to a rotomolding process for forming a multi-layer article of two different polymers with different melting points in which an outer layer polymer powder is added to a rotational molder along with an inner layer polymer powder that is separated from the outer layer powder by a release film. The release film has a particular melting point that is greater than that of the outer layer polymer and preferably between the melting points of the inside layer and outside layer polymers. In one embodiment, the release layer forms an enclosure or bag in which the inner layer (higher melting point) powder is enclosed. In another embodiment the release film forms a barrier between an insulated cavity and the mold. The process provides a means for a “one-shot” rotomolding method.
    Type: Grant
    Filed: April 4, 2007
    Date of Patent: October 4, 2011
    Assignee: Arkema Inc.
    Inventors: Gregory S. O'Brien, Bruce Clay, Ronald Partridge
  • Methods for preparing agglomerated pellets of polytetrafluoroethylene and molded articles and the agglomerated pellets of polytetrafluoroethylene and molded articles prepared thereby
    Publication number: 20050194710
    Abstract: PTFE pellets with good bulk density, homogeneity, and flowability properties may be obtained by: (1) wetting a PTFE powder with a solvent, to obtain a wetted PTFE powder; (2) forming the wetted PTFE powder into agglomerated pellets of PTFE; and (3) drying the agglomerated pellets of PTFE pellets, in which the drying of the agglomerated pellets of PTFE is carried out in a fluidized bed drier. The PTFE pellets so obtained may be used to prepare molded articles of PTFE.
    Type: Application
    Filed: May 3, 2005
    Publication date: September 8, 2005
    Applicant: Asahi Glass Fluoropolymers USA, INC.
    Inventors: Pamela Baron, Gary Eckrote, Tonya James, Ronald Partridge, Timothy Duzick
  • Methods for preparing agglomerated pellets of polytetrafluoroethylene and molded articles and the agglomerated pellets of polytetrafluoroethylene and molded articles prepared thereby
    Patent number: 6911489
    Abstract: PTFE pellets with good bulk density, homogeneity, and flowability properties may be obtained by: (1) wetting a PTFE powder with a solvent, to obtain a wetted PTFE powder; (2) forming the wetted PTFE powder into agglomerated pellets of PTFE; and (3) drying the agglomerated pellets of PTFE pellets, in which the drying of the agglomerated pellets of PTFE is carried out in a fluidized bed drier. The PTFE pellets so obtained may be used to prepare molded articles of PTFE.
    Type: Grant
    Filed: June 10, 2002
    Date of Patent: June 28, 2005
    Assignee: Asahi Glass Fluoropolymers USA, Inc.
    Inventors: Pamela J. Baron, Gary Eckrote, Tonya James, Ronald Partridge, Timothy C. Duzick
  • Methods for preparing agglomerated pellets of polytetrafluoroethylene and molded articles and the agglomerated pellets of polytetrafluoroethylene and molded articles prepared thereby
    Publication number: 20030229167
    Abstract: PTFE pellets with good bulk density, homogeneity, and flowability properties may be obtained by:
    Type: Application
    Filed: June 10, 2002
    Publication date: December 11, 2003
    Applicant: Asahi Glass Fluoropolymers USA, INC.
    Inventors: Pamela J. Baron, Gary Eckrote, Tonya James, Ronald Partridge, Timothy C. Duzick