Granted Patent
Utility
US 6,062,222 · App. 08/911,341
Face mask for self contained breathing apparatus
Inventors:
R. David Lewis, Craig W. Martin
Patented Case
View Patent ↗
Granted: May 16, 2000
Filed: Aug 14, 1997
Inventors
R. David Lewis
Craig W. Martin
Assignee (at issue)
International Safety Instruments, 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.