Granted Patent
Utility
US 4,638,459 · App. 06/696,591
Virtual ground read only memory
Inventors:
Henry Pechar, James David Sproch
Patented Case
View Patent ↗
Granted: Jan 20, 1987
Filed: Jan 31, 1985
Inventors
Henry Pechar
James David Sproch
Assignee (at issue)
STANDARD MICROSYSTEMS 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.