Circuit arrangement and method for measuring a difference in capacitance between a first capacitance C.sub.1 and a second capacitance C.sub.2

Granted: Jul 7, 1998 Filed: Jul 3, 1996

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.