Granted Patent
Utility
US 5,034,026 · App. 07/513,316
Polybenzazole polymers containing indan moieties
Inventors:
John D. Summers, Ritchie A. Wessling
Patented Case
View Patent ↗
Granted: Jul 23, 1991
Filed: Apr 20, 1990
Inventors
John D. Summers
Ritchie A. Wessling
Assignee (at issue)
THE DOW CHEMICAL 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.