Granted Patent
Utility
US 4,840,268 · App. 07/235,159
Adjustable width chain conveyor
Inventor:
Albert W. Zemek
Patented Case
View Patent ↗
Granted: Jun 20, 1989
Filed: Aug 23, 1988
Inventor
Albert W. Zemek
Assignee (at issue)
UNIVERSAL INSTRUMENTS CORPORATION
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.