Granted Patent
Utility
US 4,491,744 · App. 06/561,140
Current source direct base drive for transistor power switches
Inventor:
Philip D. Corey
Patented Case
View Patent ↗
Granted: Jan 1, 1985
Filed: Dec 14, 1983
Inventor
Philip D. Corey
Assignee (at issue)
Burroughs, Inc.
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.