Process for preparing 2,2-bis-(3-nitrophenyl)-hexafluoropropane, and 2,2-bis-(4-carboxy-3-nitrophenyl)-hexafluoropropane occurring as an intermediate

Granted: Sep 27, 1988 Filed: Jul 21, 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.