Granted Patent
Utility
US 5,597,438 · App. 08/527,909
Etch chamber having three independently controlled electrodes
Inventors:
Virinder Grewal, Volker B. Laux
Patented Case
View Patent ↗
Granted: Jan 28, 1997
Filed: Sep 14, 1995
Inventors
Virinder Grewal
Volker B. Laux
Assignee (at issue)
Siemens Aktiengesellschaft
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.