Granted Patent
Utility
US 6,407,289 · App. 09/492,327
Synthesis of N4, N4-diphenyl-N4,N4-di-m-tolyl-biphenyl-4,4'-diamine from an unsymmetrical amine
Inventors:
Sandra E. Russo-Rodriguez, Jeffrey M. Sullivan
Patented Case
View Patent ↗
Granted: Jun 18, 2002
Filed: Jan 27, 2000
Inventors
Sandra E. Russo-Rodriguez
Jeffrey M. Sullivan
Assignee (at issue)
Boulder Scientific 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.