Granted Patent
Utility
US 6,204,412 · App. 09/292,865
Method of manufacturing alkylated diphenylamine compositions and products thereof
Inventor:
John T. Lai
Patented Case
View Patent ↗
Granted: Mar 20, 2001
Filed: Apr 16, 1999
Inventor
John T. Lai
Assignee (at issue)
B. F. Goodrich Company
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.