Granted Patent
Utility
US 6,506,870 · App. 09/559,629
Polycarbonate resin for use in the production of a substrate for an optical information medium
Inventors:
Hiroshi Hachiya, Shinya Kawasoe
Patented Case
View Patent ↗
Granted: Jan 14, 2003
Filed: Apr 27, 2000
Inventors
Hiroshi Hachiya
Shinya Kawasoe
Assignee (at issue)
Asaki Kasei Kabushiki Kaisha
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.