Granted Patent
Utility
US 6,275,689 · App. 09/354,560
Double-balanced mixer
Inventor:
Hardial Gill
Patented Case
View Patent ↗
Granted: Aug 14, 2001
Filed: Jul 15, 1999
Inventor
Hardial Gill
Assignee (at issue)
Robert Bosch GmbH
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.