Granted Patent
Utility
US 5,370,004 · App. 08/068,318
Multiple port personal air sampling apparatus
Inventors:
Clayton J. Bossart, Daniel E. Bruce, Charles H. Etheridge
Patented Case
View Patent ↗
Granted: Dec 6, 1994
Filed: May 26, 1993
Inventors
Clayton J. Bossart
Daniel E. Bruce
Charles H. Etheridge
Assignee (at issue)
Mine Safety Appliances Company, LLC
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.