Granted Patent
Utility
US 4,656,491 · App. 06/552,876
Protection circuit utilizing distributed transistors and resistors
Inventor:
Hatsuhide Igarashi
Patented Case
View Patent ↗
Granted: Apr 7, 1987
Filed: Nov 17, 1983
Inventor
Hatsuhide Igarashi
Assignee (at issue)
NEC 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.