Granted Patent
Utility
US 4,839,788 · App. 07/150,139
Bipolar voltage to frequency converter
Inventor:
Thomas R. Tullsen
Patented Case
View Patent ↗
Granted: Jun 13, 1989
Filed: Jan 29, 1988
Inventor
Thomas R. Tullsen
Assignee (at issue)
Dionex 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.