Granted Patent
Utility
US 4,329,488 · App. 06/213,282
Propionic acid esters and herbicidal use thereof
Inventors:
Georg Frater, Jean Wenger
Patented Case
View Patent ↗
Granted: May 11, 1982
Filed: Dec 5, 1980
Inventors
Georg Frater
Jean Wenger
Assignee (at issue)
HOFFMANN-LA ROCHE INC.
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.