Granted Patent
Utility
US 5,206,362 · App. 07/837,131
Two-step method for preparing cyclic ureas
Inventors:
George P. Speranza, Donald H. Champion
Patented Case
View Patent ↗
Granted: Apr 27, 1993
Filed: Feb 19, 1992
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.