Patents by Inventor James L. Duffy

James L. Duffy 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).

  • Publication number: 20080266073
    Abstract: A method for monitoring the fill-up of a vehicle tire to the cold inflation pressure recommended for a cold tire condition. The method includes establishing a calibration temperature that corresponds to temperature of air in a cold tire condition, determining that air is being added to the tire, measuring the temperature of the air in the tire and adjusting the measured tire pressure to compensate for the difference between the measured temperature and the calibration temperature corresponding to a cold inflation temperature, comparing the adjusted pressure with the manufacturer's recommended pressure cold inflation pressure to determine that the recommended tire pressure has been obtained and generating a signal cognizable by the operator outside the vehicle so that the operator will cease filling the tire when the pressure is obtained.
    Type: Application
    Filed: April 25, 2007
    Publication date: October 30, 2008
    Applicant: GM GLOBAL TECHNOLOGY OPERATIONS, INC.
    Inventors: Thomas H. Tu, James L. Duffy
  • Patent number: 5590797
    Abstract: A friction clutch for a draft gear assembly includes two outer stationary plates having outer surfaces engageable with the inner surfaces of a gear housing. A slot formed in each outer stationary plate receives a lubricating insert to prevent clutch sticking after closure and during a release of such gear. A pair of movable plates have outer surfaces frictionally engaged with inner surfaces of such outer stationary plates for absorbing energy during closure of such gear. A pair of inner stationary plates have outer surfaces frictionally engaged with inner surfaces of such pair of movable plates for absorbing energy during such closure. An inner surface of each inner stationary plate is tapered. Another slot formed in each tapered stationary plate adjacent an outer surface receives another lubricating insert which prevents clutch sticking during release of the gear.
    Type: Grant
    Filed: May 10, 1995
    Date of Patent: January 7, 1997
    Assignee: Westinghouse Air Brake Company
    Inventors: James L. Duffy, David W. Daugherty, Jr., Wajih Kanjo, Rudi E. George