Patents by Inventor Lawrence S. Crewdson

Lawrence S. Crewdson 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).

  • Method of installing multiple-lift conveyor system
    Patent number: 5611421
    Abstract: A method of installing a multiple lift, vertical conveyor system in a conveyor shaft includes steps of: erecting a framework for the vertical conveyor system, installing a first belt for operation on the framework; feeding a second belt into position for installation on the framework by advancing the second belt on the first belt and installing the second belt for operation on the framework.
    Type: Grant
    Filed: February 14, 1995
    Date of Patent: March 18, 1997
    Assignee: Lake Shore Mining Company, Inc.
    Inventors: Lawrence S. Crewdson, Donald A. Shaw