Patents by Inventor David Edward Hall

David Edward Hall 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).

  • Horizontal directional drilling crossbore detector
    Patent number: 11530605
    Abstract: A crossbore detection system. The system is located in a downhole tool proximate a drill bit. The system comprises circuitry sensitive to a subsurface environment and a sensor that detects changes in the circuitry. The sensor detects changes in the circuitry that indicates that the drill bit has struck an underground pipe. The sensor may detect a series of electromagnetic signals indicative of the strike or may detect changes to an impedance bridge at a capacitive sensor.
    Type: Grant
    Filed: March 14, 2016
    Date of Patent: December 20, 2022
    Assignee: The Charles Machine Works, Inc.
    Inventors: Floyd R. Gunsaulis, Richard F. Sharp, Arun Prakash Jaganathan, David Edward Hall, Neven Simicevic
  • Horizontal Directional Drilling Crossbore Detector
    Publication number: 20160265347
    Abstract: A crossbore detection system. The system is located in a downhole tool proximate a drill bit. The system comprises circuitry sensitive to a subsurface environment and a sensor that detects changes in the circuitry. The sensor detects changes in the circuitry that indicates that the drill bit has struck an underground pipe. The sensor may detect a series of electromagnetic signals indicative of the strike or may detect changes to an impedance bridge at a capacitive sensor.
    Type: Application
    Filed: March 14, 2016
    Publication date: September 15, 2016
    Inventors: Floyd R. Gunsaulis, Richard F. Sharp, Arun Prakash Jaganathan, David Edward Hall, Neven Simicevic
  • Therapeutic compositions of 1,3-bis(2-carboxychromon-5-yloxyl)propan-2-ol and aspirin or indomethacin
    Patent number: 4066756
    Abstract: There is described a pharmaceutical mixture comprising 1,3-bis(2-carboxychromon-5-yloxy)propan-2-ol, or a pharmaceutically acceptable salt thereof, and aspirin or indomethacin. The mixture causes less gastrointestinal adverse effects than aspirin or indomethacin on their own.
    Type: Grant
    Filed: November 18, 1976
    Date of Patent: January 3, 1978
    Assignee: Fisons Limited
    Inventors: Thomas Samuel Campbell Orr, David Edward Hall, John Mann