Granted Patent
Utility
US 5,797,974 · App. 08/826,943
Respiratory filter and sampling device
Inventors:
Dennis K. Flaherty, Russell P. Gordon, Paul M. Taylor, Frank D. Zielinski
Patented Case
View Patent ↗
Granted: Aug 25, 1998
Filed: Apr 8, 1997
Inventors
Dennis K. Flaherty
Russell P. Gordon
Paul M. Taylor
Frank D. Zielinski
Assignee (at issue)
Monsanto Company
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.