Granted Patent
Utility
US 5,131,933 · App. 07/673,593
Solar cell
Inventors:
Helmut Flodl, Paul Uebele
Patented Case
View Patent ↗
Granted: Jul 21, 1992
Filed: Mar 22, 1991
Inventors
Helmut Flodl
Paul Uebele
Assignee (at issue)
Telefunken Systemtechnik 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.