Granted Patent
Utility
US 4,574,733 · App. 06/418,859
Substrate shield for preventing the deposition of nonhomogeneous films
Inventors:
Prem Nath, Kevin Hoffman
Patented Case
View Patent ↗
Granted: Mar 11, 1986
Filed: Sep 16, 1982
Inventors
Prem Nath
Kevin Hoffman
Assignee (at issue)
Energy Conversion Devices, Inc.
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.