Patents by Inventor Robert Calcote

Robert Calcote 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 of making an expanded polytetrafluoroethylene structure
    Patent number: 7226558
    Abstract: A high density microwall ePTFE structure and a method for making, involving the manipulation of a standard extruded ePTFE graft. The final product has the desired characteristics of high density, reduced wall-thickness, above-average radial strength and enhanced suture retention.
    Type: Grant
    Filed: February 5, 2004
    Date of Patent: June 5, 2007
    Assignee: Bard Peripheral Vascular, Inc.
    Inventors: Tim Nieman, Randy Earl Saylor, Robert Hunkins, Robert Calcote
  • High density microwall expanded polytetrafluoroethylene
    Publication number: 20040164445
    Abstract: A high density microwall ePTFE structure and a method for making, involving the manipulation of a standard extruded ePTFE graft. The final product has the desired characteristics of high density, reduced wall-thickness, above-average radial strength and enhanced suture retention.
    Type: Application
    Filed: February 5, 2004
    Publication date: August 26, 2004
    Applicant: Bard Peripheral Vascular, Inc
    Inventors: Tim Nieman, Randy Earl Saylor, Robert Hunkins, Robert Calcote
  • Dual porosity PTFE tubes
    Patent number: 5935667
    Abstract: A dual porosity PTFE tube including an inner surface of expanded PTFE material having a first porosity and an outer surface of expanded PTFE material having a porosity different from that of the inner surface. The preferred method includes the step of forming inner and outer preformed tubular billets of PTFE resin particles mixed with a lubricant; the outer billet is adapted to closely fit around and concentric to the inner billet. Porosity of the inner and outer surfaces is varied by changing, in the respective billets, the lubrication level and/or the PTFE resin characteristic average particle size. The inner billet is placed inside the outer billet, and the two are extruded together, thereby melding the two billets. The extrudate is then longitudinally expanded and sintered. The inner surface of the resulting PTFE tube exhibits a different porosity than the outer surface of the tube; the porosities of the inner and outer surfaces are both within a range of about 0.10-200 .mu..
    Type: Grant
    Filed: June 10, 1997
    Date of Patent: August 10, 1999
    Assignee: Impra, Inc.
    Inventors: Robert Calcote, Rajagopal R. Kowligi, Stacy Wollner
  • Method of forming dual porosity PTFE tubes by extrusion of concentric preforms
    Patent number: 5641443
    Abstract: A dual porosity PTFE tube including an inner surface of expanded PTFE material having a first porosity and an outer surface of expanded PTFE material having a porosity different from that of the inner surface. The preferred method includes the step of forming inner and outer preformed tubular billets of PTFE resin particles mixed with a lubricant; the outer billet is adapted to closely fit around and concentric to the inner billet. Porosity of the inner and outer surfaces is varied by changing, in the respective billets, the lubrication level and/or the PTFE resin characteristic average particle size. The inner billet is placed inside the outer billet, and the two are extruded together, thereby melding the two billets. The extrudate is then longitudinally expanded and sintered. The inner surface of the resulting PTFE tube exhibits a different porosity than the outer surface of the tube; the porosities of the inner and outer surfaces are both within a range of about 0.10-200 .mu..
    Type: Grant
    Filed: June 2, 1995
    Date of Patent: June 24, 1997
    Assignee: Impra, Inc.
    Inventors: Robert Calcote, Rajagopal R. Kowligi, Stacy Wollner