Granted Patent
Utility
US 5,019,653 · App. 07/522,942
Purification of polyamines derived from polyhydroxyl compounds
Inventors:
George P. Speranza, Donald H. Champion
Patented Case
View Patent ↗
Granted: May 28, 1991
Filed: May 14, 1990
Inventors
George P. Speranza
Donald H. Champion
Assignee (at issue)
Texaco Chemical Inc.
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.