Granted Patent
Utility
US 4,889,836 · App. 07/158,491
Titanium diboride-based composite articles with improved fracture toughness
Inventors:
Sergej-Tomislav Buljan, Earl G. Geary, Jr.
Patented Case
View Patent ↗
Granted: Dec 26, 1989
Filed: Feb 22, 1988
Inventors
Sergej-Tomislav Buljan
Earl G. Geary, Jr.
Assignee (at issue)
GTE Laboratories Incorporated
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.