Granted Patent
Utility
US 4,021,225 · App. 05/119,417
Combating unwanted vegetation with 1,3,4-thiadiazole-2-sulfonamides
Inventors:
Loren W. Hedrich, William C. Doyle, Jr.
Patented Case
View Patent ↗
Granted: May 3, 1977
Filed: Feb 26, 1971
Inventors
Loren W. Hedrich
William C. Doyle, Jr.
Assignee (at issue)
Gulf Research & Development Company
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.