Patents by Inventor David D. Davis

David D. Davis 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).

  • RAIL JOINT ASSEMBLY USING EMBEDDED LOAD TRANSFER KEYS AND METHOD THEREFOR
    Publication number: 20100090018
    Abstract: A rail joint assembly joining the ends of two rails together includes a pair of joint bars. Each joint bar having one side configured to the rail web side. Mechanical fasteners mount the joint bars to the web sides. Pairs of load bearing keys are embedded in web counter bores at predetermined depths into the webs and embedded in adjacent joint bar counter bores at predetermined depths into the joint bars. The pairs of keys in the webs and the joint bars transfer railway loads through the joint and substantially strengthen the rail joint assembly.
    Type: Application
    Filed: October 13, 2008
    Publication date: April 15, 2010
    Applicant: Transportation Technology Center, Inc.
    Inventors: Muhammad Naeem Akhtar, David D. Davis
  • Covered display receptacle for advertising literature
    Patent number: D326789
    Type: Grant
    Filed: April 30, 1990
    Date of Patent: June 9, 1992
    Inventor: David D. Davis