Granted Patent
Utility
US 5,373,869 · App. 08/011,850
Test probe for face piece respirators
Inventor:
Joseph Z. Zdrok
Patented Case
View Patent ↗
Granted: Dec 20, 1994
Filed: Jan 29, 1993
Inventor
Joseph Z. Zdrok
Assignee (at issue)
Cabot Safety Corporation
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.