Patents by Inventor John M. Stephens

John M. Stephens 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).

  • Catheter with tapered self-introducing low-recirculation distal tip
    Patent number: 11684749
    Abstract: Disclosed is a multi-lumen catheter having a distal end catheter tip configured to improve fluid flow into and out from the catheter tip while reducing undesired recirculation during hemodialysis treatment of a patient. A first lumen and a second lumen each extends from the catheter proximal end to the catheter distal end, the first lumen and the second lumen being parallel to each other. A septum having a first side and a second side separates the first lumen from the second lumen. Some embodiments of the catheter tip include a beveled shape region, having a first lumen orifice, a second lumen orifice, and a septum top surface. Within the beveled shape region, at least a portion of the septum first side and at least a portion of the septum top surface form a first eave over the first lumen and at least a portion of the septum second side and at least a portion of the septum top surface form a second eave over the second lumen.
    Type: Grant
    Filed: September 4, 2019
    Date of Patent: June 27, 2023
    Assignee: Medical Components, Inc.
    Inventors: Burton W. Thomas, Joshua L. Ballard, Jeffrey S. Bennett, John M. Stephens
  • Catheter with Tapered Self-Introducing Low-Recirculation Distal Tip
    Publication number: 20210060292
    Abstract: Disclosed is a multi-lumen catheter having a distal end catheter tip configured to improve fluid flow into and out from the catheter tip while reducing undesired recirculation during hemodialysis treatment of a patient. A first lumen and a second lumen each extends from the catheter proximal end to the catheter distal end, the first lumen and the second lumen being parallel to each other. A septum having a first side and a second side separates the first lumen from the second lumen. Some embodiments of the catheter tip include a beveled shape region, having a first lumen orifice, a second lumen orifice, and a septum top surface. Within the beveled shape region, at least a portion of the septum first side and at least a portion of the septum top surface form a first eave over the first lumen and at least a portion of the septum second side and at least a portion of the septum top surface form a second eave over the second lumen.
    Type: Application
    Filed: September 4, 2019
    Publication date: March 4, 2021
    Inventors: Burton W. Thomas, Joshua L. Ballard, Jeffrey S. Bennett, John M. Stephens
  • Aluminum germanium ohmic contacts to gallium arsenide
    Patent number: 4994892
    Abstract: Ohmic contacts are attached to n-type Gallium Arsenide with an alloy of Aluminum-Germanium. The contact is prepared by depositing by evaporation a sequence of 400 Angstroms of Germanium, 300 Angstroms of Nickel, and 2000 Angstroms of Aluminum and subsequent alloying.
    Type: Grant
    Filed: October 9, 1986
    Date of Patent: February 19, 1991
    Assignee: McDonnell Douglas Corporation
    Inventors: Rainer Zuleeg, Stanley H. Watanabe, John M. Stephens