Granted Patent
Utility
US 5,181,507 · App. 07/782,394
Air purifying respirator suspension
Inventors:
M. John Michel, Frederick D. Snyder, Venkateswara R. Emany
Patented Case
View Patent ↗
Granted: Jan 26, 1993
Filed: Oct 25, 1991
Inventors
M. John Michel
Frederick D. Snyder
Venkateswara R. Emany
Assignee (at issue)
WGM Safety Corp.
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.