Patents by Inventor William D. Hoffman

William D. Hoffman 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).

  • Petroleum oil analysis using liquid nitrogen cold stage—laser ablation—ICP mass spectrometry
    Patent number: 8586943
    Abstract: A novel application of a cold-stage coupled to a laser ablation-ICP-MS system is disclosed herein. The novel system of the present invention offers significant advantages over other systems employed for cooling samples prior to LA-ICP-MS analysis. The system discloses herein has multiple applications, including detection of one or more metal contaminants in an oil sample.
    Type: Grant
    Filed: November 2, 2011
    Date of Patent: November 19, 2013
    Assignee: University of North Texas
    Inventors: Guido Fridolin Verbeck, IV, William D. Hoffman
  • PETROLEUM OIL ANALYSIS USING LIQUID NITROGEN COLD STAGE - LASER ABLATION- ICP MASS SPECTROMETRY
    Publication number: 20120104244
    Abstract: A novel application of a cold-stage coupled to a laser ablation-ICP-MS system is disclosed herein. The novel system of the present invention offers significant advantages over other systems employed for cooling samples prior to LA-ICP-MS analysis. The system discloses herein has multiple applications, including detection of one or more metal contaminants in an oil sample.
    Type: Application
    Filed: November 2, 2011
    Publication date: May 3, 2012
    Applicant: UNIVERSITY OF NORTH TEXAS
    Inventors: Guido Fridolin Verbeck, IV, William D. Hoffman
  • Foam cap for evaporative coolers
    Patent number: 5720407
    Abstract: A unitary, one-piece cooler cap for evaporative coolers comprising an integral shell and molded insulation. The shell provides seating and mounting means, as well as a mold cavity.
    Type: Grant
    Filed: April 23, 1996
    Date of Patent: February 24, 1998
    Inventor: William D. Hoffman
  • Foam cap for evaporative coolers
    Patent number: 5509565
    Abstract: A unitary, one-piece cooler cap for evaporative coolers comprising an integral shell and molded insulation. The shell provides seating and mounting structure, as well as a mold cavity.
    Type: Grant
    Filed: March 17, 1994
    Date of Patent: April 23, 1996
    Inventor: William D. Hoffman
  • Carpentry tool
    Patent number: 5206966
    Abstract: A carpentry tool arranged for use as a fulcrum relative to a hammer in a carpentry environment includes a base plate formed with a trapezoidal housing extending partially along a top surface of the base plate, wherein the trapezoidal housing includes a top wall, a forward wall, and rear wall arranged for fulcruming surfaces. The housing includes a side wall orthogonally and coextensively oriented relative to a base plate first end as the housing side wall includes a handle pivotally mounted thereto. The handle is arranged with a longitudinal slot for longitudinal adjustment, as well as pivotal adjustment, of the handle relative to the housing. The handle may be formed with a tubular upper body portion to contain a hand lotion dispensing central cavity directed through a sponge cover.
    Type: Grant
    Filed: January 8, 1992
    Date of Patent: May 4, 1993
    Inventor: William D. Hoffman