Granted Patent
Utility
US 5,250,477 · App. 07/596,112
Silicon nitride based composite with improved fracture toughness
Inventors:
Joseph G. Baldoni, II, Sergej-Tomislav Buljan
Patented Case
View Patent ↗
Granted: Oct 5, 1993
Filed: Oct 11, 1990
Inventors
Joseph G. Baldoni, II
Sergej-Tomislav Buljan
Assignee (at issue)
GTE Valenite 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.