Granted Patent
Utility
US 4,975,512 · App. 07/230,422
Reformed polysilazane and method of producing same
Inventors:
Osamu Funayama, Mikiro Arai, Takeshi Isoda
Patented Case
View Patent ↗
Granted: Dec 4, 1990
Filed: Aug 10, 1988
Inventors
Osamu Funayama
Mikiro Arai
Takeshi Isoda
Assignees (at issue)
PETROLEUM ENERGY CENTER
Toa Nenryo Kogyo Kabushiki Kaisha
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.