Granted Patent
Utility
US 5,219,083 · App. 07/990,154
Stopper for reduction of particulate matter
Inventors:
Richard T. Liebert, Neil H. Brown
Patented Case
View Patent ↗
Granted: Jun 15, 1993
Filed: Dec 14, 1992
Inventors
Richard T. Liebert
Neil H. Brown
Assignee (at issue)
Sterling Winthrop 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.