Granted Patent
Utility
US 5,132,354 · App. 07/538,744
Silicon nitride precursor polymer
Inventor:
Dru L. DeLaet
Patented Case
View Patent ↗
Granted: Jul 21, 1992
Filed: Jun 15, 1990
Inventor
Dru L. DeLaet
Assignee (at issue)
Ethyl Corporation
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.