Granted Patent
Utility
US 5,006,476 · App. 07/440,456
Transistor manufacturing process using three-step base doping
Inventors:
Jan Lodewijk de Jong, Jacob G. DeGroot
Patented Case
View Patent ↗
Granted: Apr 9, 1991
Filed: Nov 20, 1989
Inventors
Jan Lodewijk de Jong
Jacob G. DeGroot
Assignee (at issue)
North American Philips Corp., Signetics Division
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.