Granted Patent
Utility
US 5,248,396 · App. 07/450,767
Process for preparing butanetetracarboxylic acid
Inventors:
Eduardo A. Casanova, Dennis J. Kalota, John H. Wagenknecht
Patented Case
View Patent ↗
Granted: Sep 28, 1993
Filed: Dec 14, 1989
Inventors
Eduardo A. Casanova
Dennis J. Kalota
John H. Wagenknecht
Assignee (at issue)
Monsanto Company
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.