Patents by Inventor Dennis D. Leatherman

Dennis D. Leatherman 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).

  • Abrasive article
    Patent number: 5114438
    Abstract: An abrasive article comprises abrasive particles bonded to microporous material wherein the microporous material comprises (a) a matrix consisting essentially of thermoplastic organic polymer, (b) a large proportion of finely divided water-insoluble siliceous filler, and (c) a large void volume.
    Type: Grant
    Filed: October 29, 1990
    Date of Patent: May 19, 1992
    Assignee: PPG Industries, Inc.
    Inventors: Dennis D. Leatherman, James J. McGinley, Daniel E. Adams, George A. Brons
  • Electrically conductive article
    Patent number: 5047283
    Abstract: Microporous material comprising (1) a matrix consisting essentially of thermoplastic organic polymer, (2) a large proportion of finely divided water-insoluble siliceous filler, and (3) interconnecting pores is coated with electrically conductive coating and/or printed with electrically conductive printing ink. The resulting products have many uses as electrically conductive articles, including electromagnetic interference shields and printed circuit boards. Three-dimensional printed circuit boards are disclosed.
    Type: Grant
    Filed: September 20, 1989
    Date of Patent: September 10, 1991
    Assignee: PPG Industries, Inc.
    Inventors: Dennis D. Leatherman, Kee V. Sin, James A. Russell
  • Active agent delivery device
    Patent number: 5035886
    Abstract: An active agent delivery device comprises (a) microporous material comprising a matrix consisting essentially of linear ultrahigh molecular weight polyolefin, a large proportion of finely divided water-insoluble filler of which at least about 50 percent by weight is siliceous, and interconnecting pores; and (b) a releasable active agent or precursor thereof associated with at least a portion of the filler.
    Type: Grant
    Filed: May 10, 1990
    Date of Patent: July 30, 1991
    Assignee: PPG Industries, Inc.
    Inventors: Paritosh M. Chakrabarti, Harlan B. Johnson, Malcolm Korach, Dennis D. Leatherman, Robert R. Simmons
  • Microporous material having a coating of hydrophobic polymer
    Patent number: 5032450
    Abstract: A coated article comprises a substantially continuous, moisture vapor permeable coating of hydrophobic polymer joined to one side of a sheet of microporous material comprises a matrix consisting essentially of linear ultrahigh molecular weight polyolefin, a large proportion of finely divided, water-insoluble siliceous filler, and interconnecting pores.
    Type: Grant
    Filed: January 31, 1990
    Date of Patent: July 16, 1991
    Assignee: PPG Industries, Inc.
    Inventors: Thomas Rechlicz, Dennis D. Leatherman
  • Active agent delivery device
    Patent number: 4959208
    Abstract: An active agent delivery device comprises (a) microporous material comprising a matrix consisting essentially of linear ultrahigh molecular weight polyolefin, a large proportion of finely divided water-insoluble filler of which at least about 50 percent by weight is siliceous, and interconnecting pores; and (b) a releasable active agent or precursor thereof associated with at least a portion of the filler.
    Type: Grant
    Filed: October 28, 1988
    Date of Patent: September 25, 1990
    Assignee: PPG Industries, Inc.
    Inventors: Paritosh M. Chakrabarti, John M. Denison, Harlan B. Johnson, Malcolm Korach, Dennis D. Leatherman, Linda P. Reinhardt, Richard A. Schwarz, Robert B. Simmons
  • Bacteria impermeable, gas permeable package
    Patent number: 4937115
    Abstract: A sterilizable or sterilized package comprises at least one microporous member comprising a matrix consisting essentially of linear ultrahigh molecular weight polyolefin, a large proportion of finely divided water-insouble siliceous filler, and interconnecting pores.
    Type: Grant
    Filed: December 19, 1988
    Date of Patent: June 26, 1990
    Assignee: PPG Industries, Inc.
    Inventor: Dennis D. Leatherman
  • Pressure-sensitive multi-part record unit
    Patent number: 4927802
    Abstract: The front side of at least one receptor sheet of a pressure-sensitive multi-part record unit comprises microporous material comprising a matrix consisting essentially of substantially water-insoluble thermoplastic organic polymer, a large proportion of finely divided, water-insoluble siliceous particles, and interconnecting pores.
    Type: Grant
    Filed: December 9, 1988
    Date of Patent: May 22, 1990
    Assignee: PPG Industries, Inc.
    Inventor: Dennis D. Leatherman
  • Multilayer article of microporous and substantially nonporous materials
    Patent number: 4892779
    Abstract: A multilayer article comprises at least one layer of substantially nonporous material fusion bonded in the absence of extrinsic intervening adhesive to at least one layer of microporous material comprising a matrix consisting essentially of linear ultrahigh molecular weight polyolefin, a large proportion of finely divided, water-insoluble filler at least about 50 percent of which is siliceous, and interconnecting pores.
    Type: Grant
    Filed: December 19, 1988
    Date of Patent: January 9, 1990
    Assignee: PPG Industries, Inc.
    Inventors: Dennis D. Leatherman, Richard A. Schwarz
  • Multilayer article of microporous and porous materials
    Patent number: 4877679
    Abstract: A multilayer article comprises at least one layer of substantially porous material bonded to at least one layer of microporous material comprising a matrix consisting essentially of linear ultrahigh molecular weight polyolefin, a large proportion of finely divided, water-insoluble siliceous filler, and interconnecting pores. The microporous material has regions of stretch-induced molecularly oriented polymer in the matrix.
    Type: Grant
    Filed: December 19, 1988
    Date of Patent: October 31, 1989
    Assignee: PPG Industries, Inc.
    Inventors: Dennis D. Leatherman, Thomas Rechlicz, Richard A. Schwarz
  • Printed microporous material
    Patent number: 4861644
    Abstract: Microporous material substrate comprising (1) a matrix consisting essentially of linear ultrahigh molecular weight polyolefin, (2) a large proportion of finely divided water-insoluble siliceous filler, and (3) interconnecting pores is printed with printing ink.
    Type: Grant
    Filed: August 30, 1988
    Date of Patent: August 29, 1989
    Assignee: PPG Industries, Inc.
    Inventors: James Young, Dennis D. Leatherman
  • Stretched microporous material
    Patent number: 4833172
    Abstract: Precursor microporous material comprising a matrix consisting essentially of linear ultrahigh molecular weight polyolefin, a large proportion of finely divided water-insoluble siliceous filler, and interconnecting pores is stretched to increase the porosity and provide regions of stretch-induced molecularly oriented polymer in the matrix.
    Type: Grant
    Filed: September 15, 1988
    Date of Patent: May 23, 1989
    Assignee: PPG Industries, Inc.
    Inventors: Richard A. Schwarz, Thomas H. Leigh, Dennis D. Leatherman