Granted Patent
Utility
US 5,648,509 · App. 08/508,145
Process for the preparation of diesters of phosphonocarboxylic acid derivatives
Inventors:
Salman Dermeik, Martina Wanner, Karl-Heinz Lemmer, Reinhold Braun
Patented Case
View Patent ↗
Granted: Jul 15, 1997
Filed: Jul 27, 1995
Inventors
Salman Dermeik
Martina Wanner
Karl-Heinz Lemmer
Reinhold Braun
Assignee (at issue)
Ciba-Geigy
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.