Granted Patent
Utility
US 6,548,458 · App. 10/008,510
Succinimide-acid compounds and derivatives thereof
Inventor:
John T. Loper
Patented Case
View Patent ↗
Granted: Apr 15, 2003
Filed: Nov 8, 2001
Inventor
John T. Loper
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.