Granted Patent
Utility
US 5,168,320 · App. 07/322,217
Colorimeter
Inventors:
Carl David Lutz, Thomas A. Lianza
Patented Case
View Patent ↗
Granted: Dec 1, 1992
Filed: Mar 13, 1989
Inventors
Carl David Lutz
Thomas A. Lianza
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.