Granted Patent
Utility
US 6,125,845 · App. 08/939,995
Respirator fit-testing with size selected aerosol
Inventors:
Thomas Halvorsen, Patricia B. Keady McDonald
Patented Case
View Patent ↗
Granted: Oct 3, 2000
Filed: Aug 29, 1997
Inventors
Thomas Halvorsen
Patricia B. Keady McDonald
Assignee (at issue)
TSI Group Co., Ltd.
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.