Granted Patent
Utility
US 4,838,924 · App. 07/039,457
Aromatic urea derivatives and their use as herbicide
Inventors:
Tetsuo Takematsu, Daisuke Fukuoka, Katsuya Takahashi, Isao Hashimoto
Patented Case
View Patent ↗
Granted: Jun 13, 1989
Filed: Apr 1, 1987
Inventors
Tetsuo Takematsu
Daisuke Fukuoka
Katsuya Takahashi
Isao Hashimoto
Assignee (at issue)
Mitsui Petrochemical Industries, Ltd.
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.