Granted Patent
Utility
US 5,883,221 · App. 08/988,023
Synthesis of polybenzoxasole and polybenzothiazole precursors
Inventors:
Recai Sezi, Eberhard Kuehn, Hellmut Ahne, Sueleyman Kocman
Patented Case
View Patent ↗
Granted: Mar 16, 1999
Filed: Dec 10, 1997
Inventors
Recai Sezi
Eberhard Kuehn
Hellmut Ahne
Sueleyman Kocman
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.