bi-CMOS buffer cascaded to CMOS driver having PMOS pull-up transistor with threshold voltage greater than VBE of bi-CMOS bipolar pull-up transistor

Granted: Feb 21, 1989 Filed: Sep 2, 1987

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.