Granted Patent
Utility
US 4,975,639 · App. 07/238,711
Test head with improved shielding
Inventors:
Kiyoyasu Hiwada, Toshio Tamamura
Patented Case
View Patent ↗
Granted: Dec 4, 1990
Filed: Aug 30, 1988
Inventors
Kiyoyasu Hiwada
Toshio Tamamura
Assignee (at issue)
Hewlett-Packard Company, L.P.
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.