Granted Patent
Utility
US 5,334,339 · App. 07/199,237
Boron nitride sinter and process for its production
Inventors:
Masazumi Nakashima, Hiroshi Nakawara, Suminiko Kurita
Patented Case
View Patent ↗
Granted: Aug 2, 1994
Filed: May 19, 1988
Inventors
Masazumi Nakashima
Hiroshi Nakawara
Suminiko Kurita
Assignee (at issue)
Kabushiki Kaisha Kopuran
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.