Patents by Inventor Charles K. Renfro

Charles K. Renfro 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).

  • Multi-chambered fluid mixing apparatus and method
    Patent number: 8132958
    Abstract: A method and apparatus for substantially simultaneously mixing two fluids to form a mixture for application to a substrate.
    Type: Grant
    Filed: December 12, 2007
    Date of Patent: March 13, 2012
    Inventor: Charles K. Renfro
  • Method for mixing additive into viscous material
    Patent number: 7980755
    Abstract: A mixing apparatus having a mixing impeller affixed to the end of a mixer shaft which is reciprocably and rotatably or non-rotatably mounted thru mixer seal structure which has surface portions adapted to be brought into sealing engagement with the open filler end of a retail off-the-shelf tube of viscous caulking or sealant compound or the like, wherein the shaft and impeller are adapted to be reciprocated thru the compound and an additive contained in the tube substantially the entire length of the tube to rapidly and intimately mix the compound with colorant or other additive added directly into the retail tube thru its filler (back) end.
    Type: Grant
    Filed: February 26, 2007
    Date of Patent: July 19, 2011
    Inventor: Charles K. Renfro
  • Method for mixing colorant with a viscous material
    Patent number: 7407321
    Abstract: A mixing apparatus having a blade mixer affixed to the end of a mixer shaft which is rotatably or non-rotatably, but slidably mounted thru a mixer seal member which is adapted to be brought into sealing engagement with the open filler end of a retail tube of viscous caulking compound, wherein the shaft and mixer are adapted to be reciprocated thru the viscous compound contained in the tube substantially the entire length of the tube to rapidly and intimately mix the compound with colorant injected thereinto directly in the retail tube.
    Type: Grant
    Filed: May 28, 2005
    Date of Patent: August 5, 2008
    Inventor: Charles K. Renfro
  • MULTI-CHAMBERED FLUID MIXING APPARATUS AND METHOD
    Publication number: 20080144433
    Abstract: A method and apparatus for substantially simultaneously mixing two fluids to form a mixture for application to a substrate.
    Type: Application
    Filed: December 12, 2007
    Publication date: June 19, 2008
    Inventor: Charles K. Renfro
  • Mixing apparatus having rotational and axial motion
    Patent number: 7070318
    Abstract: A mixing apparatus having a rotating blade mixer affixed to the end of a mixer shaft which is rotatably mounted thru a mixer seal member which is adapted to be brought into sealing engagement with the open filler end of a retail tube of viscous caulking compound, wherein the shaft and mixer are adapted to be rotated and reciprocated thru the viscous compound contained in the tube substantially the entire length of the tube to rapidly and intimately mix the compound with colorant injected thereinto directly in the retail tube.
    Type: Grant
    Filed: April 2, 2002
    Date of Patent: July 4, 2006
    Inventor: Charles K. Renfro
  • Mixing apparatus and method
    Patent number: 6910799
    Abstract: A mixing apparatus having a blade mixer affixed to the end of a mixer shaft which is rotatably or non-rotatably, but slidably mounted thru a mixer seal member which is adapted to be brought into sealing engagement with the open filler end of a retail tube of viscous caulking compound, wherein the shaft and mixer are adapted to be reciprocated thru the viscous compound contained in the tube substantially the entire length of the tube to rapidly and intimately mix the compound with colorant injected thereinto directly in the retail tube.
    Type: Grant
    Filed: November 14, 2002
    Date of Patent: June 28, 2005
    Inventor: Charles K. Renfro
  • Mixing apparatus and method
    Publication number: 20030099153
    Abstract: A mixing apparatus having a blade mixer affixed to the end of a mixer shaft which is rotatably or non-rotatably, but slidably mounted thru a mixer seal member which is adapted to be brought into sealing engagement with the open filler end of a retail tube of viscous caulking compound, wherein the shaft and mixer are adapted to be reciprocated thru the viscous compound contained in the tube substantially the entire length of the tube to rapidly and intimately mix the compound with colorant injected thereinto directly in the retail tube.
    Type: Application
    Filed: November 14, 2002
    Publication date: May 29, 2003
    Inventor: Charles K. Renfro
  • Mixing apparatus and method
    Publication number: 20020154568
    Abstract: A mixing apparatus having a rotating blade mixer affixed to the end of a mixer shaft which is rotatably mounted thru a mixer seal member which is adapted to be brought into sealing engagement with the open filler end of a retail tube of viscous caulking compound, wherein the shaft and mixer are adapted to be rotated and reciprocated thru the viscous compound contained in the tube substantially the entire length of the tube to rapidly and intimately mix the compound with colorant injected thereinto directly in the retail tube.
    Type: Application
    Filed: April 2, 2002
    Publication date: October 24, 2002
    Inventor: Charles K. Renfro