Granted Patent
Utility
US 4,931,239 · App. 07/178,604
Alumina fiber structure and process for its production
Inventors:
Hisataka Hosoi, Hozumi Endo, Tatsuo Ando, Mamoru Shoji
Patented Case
View Patent ↗
Granted: Jun 5, 1990
Filed: Jun 8, 1988
Inventors
Hisataka Hosoi
Hozumi Endo
Tatsuo Ando
Mamoru Shoji
Assignee (at issue)
Mitsubishi Kasei 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.