Granted Patent
Utility
US 4,809,149 · App. 07/058,292
Single-ended down converter
Inventor:
Krahl Burghard
Patented Case
View Patent ↗
Granted: Feb 28, 1989
Filed: Jun 5, 1987
Inventor
Krahl Burghard
Assignee (at issue)
U.S. Philips 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.