Patents by Inventor David R. Benjamin

David R. Benjamin 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).

  • Apparatus for controlled stabilized descent
    Patent number: 6889798
    Abstract: An apparatus for descent, suspension and retrieval of a worker through an opening in the ground includes a trailer having a boom assembly mounted thereon is described. The boom assembly includes telescopically extensible and retractable boom members that are extended downwardly by action of gravity through opening to a subsurface location. The worker is supported in a stabilized manner during descent, suspension, and retraction of the boom members.
    Type: Grant
    Filed: March 7, 2001
    Date of Patent: May 10, 2005
    Inventors: Steven L. Overby, David R. Benjamin
  • Apparatus for controlled stabilized descent
    Publication number: 20010030082
    Abstract: An apparatus for descent, suspension and retrieval of a worker through an opening in the ground includes a trailer having a boom assembly mounted thereon is described. The boom assembly includes telescopically extensible and retractable boom members that are extended downwardly by action of gravity through opening to a subsurface location. The worker is supported in a stabilized manner during descent, suspension, and retraction of the boom members.
    Type: Application
    Filed: March 7, 2001
    Publication date: October 18, 2001
    Inventors: Steven L. Overby, David R. Benjamin