Granted Patent
Utility
US 6,673,628 · App. 09/777,549
Analytical test device and method
Inventors:
Helmut Freitag, Qinwei Shi, Charles A. Harrington
Patented Case
View Patent ↗
Granted: Jan 6, 2004
Filed: Feb 6, 2001
Inventors
Helmut Freitag
Qinwei Shi
Charles A. Harrington
Assignee (at issue)
Spectral Diagnostics, Inc
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.