Granted Patent
Utility
US 5,557,118 · App. 08/352,053
Hetero-junction type bipolar transistor
Inventor:
Takasuke Hashimoto
Patented Case
View Patent ↗
Granted: Sep 17, 1996
Filed: Nov 30, 1994
Inventor
Takasuke Hashimoto
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.