Granted Patent
Utility
US 4,638,240 · App. 06/805,497
Base drive circuit for high-power switching transistor
Inventors:
Armando Pauker, Richard B. Preuit
Patented Case
View Patent ↗
Granted: Jan 20, 1987
Filed: Dec 5, 1985
Inventors
Armando Pauker
Richard B. Preuit
Assignee (at issue)
Tandem Computers 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.