Granted Patent
Utility
US 5,041,668 · App. 07/338,985
Secondary diamines
Inventors:
Christopher J. Nalepa, J. Kenneth Presswood, Gordon G. Knapp
Patented Case
View Patent ↗
Granted: Aug 20, 1991
Filed: Apr 14, 1989
Inventors
Christopher J. Nalepa
J. Kenneth Presswood
Gordon G. Knapp
Assignee (at issue)
Ethyl Corporation
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.