Granted Patent
Utility
US 6,411,139 · App. 09/917,556
Frequency doubling circuit
Inventor:
Reinhold Unterricker
Patented Case
View Patent ↗
Granted: Jun 25, 2002
Filed: Jul 27, 2001
Inventor
Reinhold Unterricker
Assignee (at issue)
Infineon Technologies 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.