Granted Patent
Utility
US 4,832,490 · App. 07/080,428
Photometer
Inventors:
Michael Boos, Werner Klug, Alfons Zoller
Patented Case
View Patent ↗
Granted: May 23, 1989
Filed: Jul 31, 1987
Inventors
Michael Boos
Werner Klug
Alfons Zoller
Assignee (at issue)
Leybold-Heraeus GmbH
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.