Granted Patent
Utility
US 4,051,444 · App. 05/693,258
Amplifier structure for low-level voltage measurements
Inventor:
Heinz Walter Gruner
Patented Case
View Patent ↗
Granted: Sep 27, 1977
Filed: Jun 7, 1976
Inventor
Heinz Walter Gruner
Assignee (at issue)
Sybron 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.