Granted Patent
Utility
US 4,698,443 · App. 06/753,693
Biuret purification
Inventors:
Donald C. Young, James A. Green, II
Patented Case
View Patent ↗
Granted: Oct 6, 1987
Filed: Jul 10, 1985
Inventors
Donald C. Young
James A. Green, II
Assignee (at issue)
Union Oil Company of California
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.