Granted Patent
Utility
US 6,150,558 · App. 09/161,144
Bis-o-amino(thio)phenols, and their preparation
Inventors:
Recai Sezi, Michael Keitmann
Patented Case
View Patent ↗
Granted: Nov 21, 2000
Filed: Sep 24, 1998
Inventors
Recai Sezi
Michael Keitmann
Assignee (at issue)
Siemens Aktiengesellschaft
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.