Granted Patent
Utility
US 5,208,192 · App. 07/647,533
Preceramic polysilazane compositions
Inventors:
Yuan-Fu Yu, Eric W. Liimatta
Patented Case
View Patent ↗
Granted: May 4, 1993
Filed: Jan 15, 1991
Inventors
Yuan-Fu Yu
Eric W. Liimatta
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.