Granted Patent
Utility
US 5,216,281 · App. 07/750,098
Self sealed aligned contact incorporating a dopant source
Inventor:
Douglas Butler
Patented Case
View Patent ↗
Granted: Jun 1, 1993
Filed: Aug 26, 1991
Inventor
Douglas Butler
Assignee (at issue)
Ramtron Corporation
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.