Patents by Inventor Donald H. Sheffield

Donald H. Sheffield 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).

  • Patent number: 8029471
    Abstract: An access device is disclosed that comprises two main assemblies. The first assembly is the cylindrical cannulation assembly. This is the needle-point-bearing assembly which facilitates cannulation (i.e., insertion of the assembly into the arm of the patient). The cylindrical cannulation assembly comprises a cannulation cylinder which has an insertion point (i.e., the needle puncture point) at a first end. The second main assembly of the invention is the cylindrical conduit assembly. This is the assembly that facilitates fluid flow during treatment free of the worry that the very needle which facilitated access will internally lacerate the blood vessel. The cylindrical conduit assembly comprises a cylindrical conduit which is telescopically positioned within the cannulation cylinder. The cannulation cylinder and cylindrical conduit longitudinally move relative to one another.
    Type: Grant
    Filed: August 19, 2005
    Date of Patent: October 4, 2011
    Inventors: Abdul N. Khan-Sahibzada, Donald H. Sheffield, Thomas G. Fulbright
  • Patent number: 3964380
    Abstract: An apparatus for handling sheets of material of various lengths such as consecutive plots from a computer printout device. The apparatus is comprised of a housing adapted to be affixed to a source such as the output section of a computer printout device. A takeup roller is mounted in the housing and is adapted to receive the material as it is fed from the source. When all of the material of a particular sheet has been rolled, a means ejects the material off the roller. As the roll of material is ejected from the roller, a securing means, e.g., elastic band, is automatically applied to the material to secure it in a rolled condition.
    Type: Grant
    Filed: May 16, 1975
    Date of Patent: June 22, 1976
    Assignee: Mobil Oil Corporation
    Inventors: Charles H. Meyer, Donald H. Sheffield, George N. Willman