Granted Patent
Utility
US 6,255,674 · App. 09/323,141
Silicon-germanium heterobipolar transistor with a step-wise graded base
Inventors:
Johann-Friedrich Luy, Helmut Jorke
Patented Case
View Patent ↗
Granted: Jul 3, 2001
Filed: Jun 1, 1999
Inventors
Johann-Friedrich Luy
Helmut Jorke
Assignee (at issue)
Daimlerchrysler AG
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.