Granted Patent
Utility
US 4,752,515 · App. 06/800,026
Alumina fiber structure
Inventors:
Hisataka Hosoi, Hozumi Endo, Tatsuo Ando, Mamoru Shoji
Patented Case
View Patent ↗
Granted: Jun 21, 1988
Filed: Nov 20, 1985
Inventors
Hisataka Hosoi
Hozumi Endo
Tatsuo Ando
Mamoru Shoji
Assignee (at issue)
Mitsubishi Chemical Industries, Ltd.
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.