Granted Patent
Utility
US 4,137,258 · App. 05/894,222
Process for making pure salicylic acid
Inventors:
Eugene R. Moore, Roger L. Briggs, David Charles McDonald, Richard B. Hoffman
Patented Case
View Patent ↗
Granted: Jan 30, 1979
Filed: Apr 7, 1978
Inventors
Eugene R. Moore
Roger L. Briggs
David Charles McDonald
Richard B. Hoffman
Assignee (at issue)
THE DOW CHEMICAL 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.