Patents by Inventor John Tkaczyk

John Tkaczyk 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).

  • Publication number: 20050084069
    Abstract: A method for analyzing materials in an object includes acquiring x-ray projection data of the object at high energy and at low energy for a plurality of views. The acquired x-ray projection data is utilized in a material decomposition to determine material densities at each pixel for two selected basis materials. A composition of an object at each pixel is determined utilizing a determined mapping of material density regions for the two selected basis materials. An image indicative of the composition of the object is displayed utilizing the determined composition.
    Type: Application
    Filed: October 16, 2003
    Publication date: April 21, 2005
    Inventors: Yanfeng Du, John Tkaczyk
  • Patent number: 5398950
    Abstract: The present invention generally relates to a roller skate, and preferably an in-line roller skate having a foot platform suspended between front and rear wheels for increased stability. One feature the present invention is a retractable wheel positioned between the front and rear wheels. Another feature of the invention is a contoured toe piece removably attached to the foot platform and a heel piece pivotably attached to the foot platform. A still further feature of the invention is that the heel piece is slidable to allow the skate to accommodate shoes of various sizes. A still further feature of the present invention is its effective and easy to use streamline brake system.
    Type: Grant
    Filed: November 4, 1993
    Date of Patent: March 21, 1995
    Inventor: John Tkaczyk
  • Patent number: 5286043
    Abstract: The present invention generally relates to a roller skate, and preferably an in-line roller skate having a foot platform suspended between front and rear wheels for increased stability. One feature the present invention is a retractable wheel positioned between the front and rear wheels. Another feature of the invention is a contoured toe piece removably attached to the foot platform and a heel piece pivotably attached to the foot platform. A still further feature of the invention is that the heel piece is slidable to allow the skate to accommodate shoes of various sizes. A still further feature of the present invention is its effective and easy to use streamline brake system.
    Type: Grant
    Filed: August 31, 1992
    Date of Patent: February 15, 1994
    Inventor: John Tkaczyk