Granted Patent
Utility
US 6,050,261 · App. 08/926,788
Combination backframe and self contained breathing apparatus
Inventors:
R. David Lewis, Robert E. Gray, Donald W. Dawson, Paul D. Hiltman
Patented Case
View Patent ↗
Granted: Apr 18, 2000
Filed: Sep 10, 1997
Inventors
R. David Lewis
Robert E. Gray
Donald W. Dawson
Paul D. Hiltman
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.