Granted Patent
Utility
US 4,890,146 · App. 07/133,710
High voltage level shift semiconductor device
Inventors:
Richard K. Williams, Steven H. Bolger, Duane J. Rothacher
Patented Case
View Patent ↗
Granted: Dec 26, 1989
Filed: Dec 16, 1987
Inventors
Richard K. Williams
Steven H. Bolger
Duane J. Rothacher
Assignee (at issue)
SILICONIX INCORPORATED
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.