Patents by Inventor Patrick Christopher

Patrick Christopher 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).

  • Methods and apparatus for boom hoist systems
    Patent number: 6092789
    Abstract: A boom hoist system for supporting and adjusting the position of a lifting crane gantry is provided including a drum, a drive system, and first and second braking systems for selectively stopping rotation of the drum. The boom hoist system operates independently from crane mechanical works and the first and second braking systems may include sensors for automatically engaging when specified conditions occur in order to prevent a hoisted gantry from falling uncontrollably in the event of a hoist system malfunction or failure.
    Type: Grant
    Filed: March 19, 1998
    Date of Patent: July 25, 2000
    Assignees: Hugo Nev Corporation, Joint Venture Operations, Inc.
    Inventors: Patrick Christopher, Daniel R. Juneau, Herman J. Schellstede