Granted Patent
Utility
US 4,758,542 · App. 07/082,698
Low thermal expansion ZrTiO.sub.4 --Al.sub.2 TiO.sub.5 --ZrO.sub.2 compositions
Inventor:
Frederick J. Parker
Patented Case
View Patent ↗
Granted: Jul 19, 1988
Filed: Aug 7, 1987
Inventor
Frederick J. Parker
Assignee (at issue)
W. R. Grace & Co.
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.