Polymethacrylate esters, the ester groups of which in the .alpha. and optionally also in the .omega. position differ from the ester groups in the chain

Granted: Nov 5, 1996 Filed: Jan 19, 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.