Granted Patent
Utility
US 4,833,001 · App. 07/105,612
Glass substrate for a magnetic disc and process for its production
Inventors:
Takashi Kijima, Jyun Matsui, Takaaki Sera, Takayuki Kobayashi, Shunji Takakusa, Hiroshi Ogata
Patented Case
View Patent ↗
Granted: May 23, 1989
Filed: Oct 8, 1987
Inventors
Takashi Kijima
Jyun Matsui
Takaaki Sera
Takayuki Kobayashi
Shunji Takakusa
Hiroshi Ogata
Assignee (at issue)
ASAHI GLASS CO., 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.