Granted Patent
Utility
US 5,611,421 · App. 08/388,322
Method of installing multiple-lift conveyor system
Inventors:
Lawrence S. Crewdson, Donald A. Shaw
Patented Case
View Patent ↗
Granted: Mar 18, 1997
Filed: Feb 14, 1995
Inventors
Lawrence S. Crewdson
Donald A. Shaw
Assignee (at issue)
Lake Shore Mining Company, Inc.
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.