Granted Patent
Utility
US 5,043,790 · App. 07/505,242
Sealed self aligned contacts using two nitrides process
Inventor:
Douglas Butler
Patented Case
View Patent ↗
Granted: Aug 27, 1991
Filed: Apr 5, 1990
Inventor
Douglas Butler
Assignees (at issue)
Ramtron Corporation
NMB Semiconductor Company, Ltd.
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.