Granted Patent
Utility
US 4,935,900 · App. 07/225,291
Dynamic random access memory with a self-refreshing function
Inventor:
Akira Ohsawa
Patented Case
View Patent ↗
Granted: Jun 19, 1990
Filed: Jul 27, 1988
Inventor
Akira Ohsawa
Assignee (at issue)
Matsushita Electronics 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.