Granted Patent
Utility
US 4,693,989 · App. 06/737,930
Preparation and sintering of refractory metal borides, carbides and nitrides of high purity
Inventor:
Ajit Sane
Patented Case
View Patent ↗
Granted: Sep 15, 1987
Filed: May 29, 1985
Inventor
Ajit Sane
Assignee (at issue)
Eltech Systems 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.