Granted Patent
Utility
US 4,275,077 · App. 06/110,375
Insecticidal acyl urea derivatives
Inventors:
Heinz-Manfred Becher, Richard Sehring, Walter Wirtz, Ricarda Prokic-Immel
Patented Case
View Patent ↗
Granted: Jun 23, 1981
Filed: Jan 8, 1980
Inventors
Heinz-Manfred Becher
Richard Sehring
Walter Wirtz
Ricarda Prokic-Immel
Assignee (at issue)
Celamerck GmbH & Co. KG
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.