Granted Patent
Utility
US 5,326,729 · App. 08/013,396
Transparent quartz glass and process for its production
Inventors:
Susumu Yaba, Shinya Kikugawa
Patented Case
View Patent ↗
Granted: Jul 5, 1994
Filed: Feb 4, 1993
Inventors
Susumu Yaba
Shinya Kikugawa
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.