N-[(pentaalkyl-cyclopentadienyl)methyl]-glycines, process for the preparation of the compounds and the use thereof in the manufacture of N-phosphonomethylglycine

Granted: Jun 9, 1992 Filed: May 16, 1991

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.