Granted Patent
Utility
US 4,268,449 · App. 06/123,809
Method for the preparation of furan-2-carboxylic acid amide and the corresponding furan-2-carboxylic acid
Inventor:
Gerhard O. Kuehnhanss
Patented Case
View Patent ↗
Granted: May 19, 1981
Filed: Feb 22, 1980
Inventor
Gerhard O. Kuehnhanss
Assignee (at issue)
Ethyl 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.