Granted Patent
Utility
US 5,455,434 · App. 08/286,987
Thyristor with breakdown region
Inventor:
Frank Pfirsch
Patented Case
View Patent ↗
Granted: Oct 3, 1995
Filed: Aug 8, 1994
Inventor
Frank Pfirsch
Assignee (at issue)
Siemens Aktiengesellschaft
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.