Granted Patent
Utility
US 4,801,989 · App. 07/016,611
Dynamic random access memory having trench capacitor with polysilicon lined lower electrode
Inventor:
Masao Taguchi
Patented Case
View Patent ↗
Granted: Jan 31, 1989
Filed: Feb 19, 1987
Inventor
Masao Taguchi
Assignee (at issue)
Fujitsu Limited
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.