Granted Patent
Utility
US 4,521,597 · App. 06/542,312
Process for producing sulfonylureas having a herbicidal action
Inventors:
Haukur Kristinsson, Werner Topfl
Patented Case
View Patent ↗
Granted: Jun 4, 1985
Filed: Oct 14, 1983
Inventors
Haukur Kristinsson
Werner Topfl
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.