Granted Patent
Utility
US 4,971,438 · App. 07/319,136
Graphite tube furnace with specimen support for atomic absorption spectroscopy
Inventors:
Bruno Hutsch, Bernd Schmidt
Patented Case
View Patent ↗
Granted: Nov 20, 1990
Filed: Mar 3, 1989
Inventors
Bruno Hutsch
Bernd Schmidt
Assignee (at issue)
Ringsdorff-Werke 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.