Granted Patent
Utility
US 4,465,856 · App. 06/340,597
Process for purifying methacrylamide
Inventors:
Masato Horiuchi, Yoshinori Hatazaki, Kouji Terada
Patented Case
View Patent ↗
Granted: Aug 14, 1984
Filed: Jan 19, 1982
Inventors
Masato Horiuchi
Yoshinori Hatazaki
Kouji Terada
Assignee (at issue)
Mitsui Toatsu Chemicals, Incorporated
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.