Granted Patent
Utility
US 4,944,787 · App. 06/673,508
Thermally stable urea-sulfuric acid compositions and methods of manufacture
Inventor:
Donald C. Young
Patented Case
View Patent ↗
Granted: Jul 31, 1990
Filed: Nov 20, 1984
Inventor
Donald C. Young
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.