Patents by Inventor Roger L. Shelton

Roger L. Shelton 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).

  • Downhole tool methods and systems with variable impedance control
    Patent number: 10047597
    Abstract: A disclosed method includes outputting, by an electrical component residing in a downhole tool, a clocked digital output. The method also includes adjusting, by a variable impedance circuit external to the electrical component, an impedance value in series with the clocked digital output as a function of temperature.
    Type: Grant
    Filed: November 14, 2013
    Date of Patent: August 14, 2018
    Assignee: Halliburton Energy Services, Inc.
    Inventors: Thanh T. Tran, Roger L. Shelton
  • DOWNHOLE TOOL METHODS AND SYSTEMS WITH VARIABLE IMPEDANCE CONTROL
    Publication number: 20160251952
    Abstract: A disclosed method includes outputting, by an electrical component residing in a downhole tool, a clocked digital output. The method also includes adjusting, by a variable impedance circuit external to the electrical component, an impedance value in series with the clocked digital output as a function of temperature.
    Type: Application
    Filed: November 14, 2013
    Publication date: September 1, 2016
    Applicant: HALLIBURTON ENERGY SERVICES, INC.
    Inventors: Thanh T. Tran, Roger L. Shelton
  • Associative cache and method for replacing data entries having an IO state
    Patent number: 6636944
    Abstract: An associative cache and method for replacing data entries in the associative cache by marking input-output (IO) device entries with an IO state. The IO state of a data entry may be indicated by a status or state tag. When valid data entries in a cache must be replaced to make way for new data, entries marked with an IO state are replaced first. This order of replacement improves the cache hit rate by non-IO agents such as data processors by preserving their data entries in the cache. If no valid data entries in the associative cache are marked with an IO state, the method reverts to conventional replacement algorithms such as random or least-recently-used (LRU) to determine which data will be replaced.
    Type: Grant
    Filed: April 24, 1997
    Date of Patent: October 21, 2003
    Assignee: International Business Machines Corporation
    Inventors: Bruce Michael Gilbert, Robert J. Joersz, Roger L. Shelton