Granted Patent
Utility
US 4,451,278 · App. 05/276,151
1-Hydroxyanthraquinone aquatic herbicide
Inventor:
David I. Randall
Patented Case
View Patent ↗
Granted: May 29, 1984
Filed: Jul 28, 1972
Inventor
David I. Randall
Assignee (at issue)
GAF Corporation
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.