Granted Patent
Utility
US 5,653,839 · App. 08/415,985
Fire-resistant glass and process for production thereof
Inventors:
Hiroshi Itoh, Takashi Abe, Hitoshi Yamashita, Toshihiro Yoshimura, Takeshi Hisanaga, Takao Takebayashi, Kunio Nakata, Chikara Hashimoto
Patented Case
View Patent ↗
Granted: Aug 5, 1997
Filed: Apr 4, 1995
Inventors
Hiroshi Itoh
Takashi Abe
Hitoshi Yamashita
Toshihiro Yoshimura
Takeshi Hisanaga
Takao Takebayashi
Kunio Nakata
Chikara Hashimoto
Assignees (at issue)
Mitsui Toatsu Chemicals, Incorporated
Central Glass Company, Limited
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.