Process for preparing substituted benzo[1,2-g]-chrom-3-ene, benzo[1,2-g]-thiochrom-3-ene and benzo[1,2-g]-1,2-dihydroquinoline derivatives

Granted: Mar 28, 2000 Filed: May 7, 1999

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.