Granted Patent
Utility
US 5,335,831 · App. 08/054,178
Insertable toner hopper sealing strip
Inventor:
Mark Duane Foster
Patented Case
View Patent ↗
Granted: Aug 9, 1994
Filed: Apr 30, 1993
Inventor
Mark Duane Foster
Assignee (at issue)
Lexmark International, 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.