Granted Patent
Utility
US 4,260,821 · App. 06/020,562
Minimizing polymerization during recovery of methacrylic acid
Inventor:
Bruce W. Benjamin
Patented Case
View Patent ↗
Granted: Apr 7, 1981
Filed: Mar 15, 1979
Inventor
Bruce W. Benjamin
Assignee (at issue)
Halcon Research and Development Corp.
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.