Granted Patent
Utility
US 5,597,393 · App. 08/271,147
Displaceable filtering apparatus for airborne contaminates
Inventors:
Randall F. Johnson, Christopher George Stewart
Patented Case
View Patent ↗
Granted: Jan 28, 1997
Filed: Jul 6, 1994
Inventors
Randall F. Johnson
Christopher George Stewart
Assignee (at issue)
Joy MM Delaware, 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.