Granted Patent
Utility
US 5,636,728 · App. 08/349,444
Expandable conveyor with power module
Inventors:
John W. Best, James D. Walker
Patented Case
View Patent ↗
Granted: Jun 10, 1997
Filed: Dec 5, 1994
Inventors
John W. Best
James D. Walker
Assignee (at issue)
Northstar Industries, 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.