Granted Patent
Utility
US 6,294,641 · App. 09/381,278
Polycarbonate resin, optical-information recording medium substrate made of the same, and optical-information recording medium
Inventors:
Masaaki Miyamoto, Motonori Ueda, Kiyoji Kuma, Ryuji Uchimura, Yoshitaka Shiraishi
Patented Case
View Patent ↗
Granted: Sep 25, 2001
Filed: Sep 20, 1999
Inventors
Masaaki Miyamoto
Motonori Ueda
Kiyoji Kuma
Ryuji Uchimura
Yoshitaka Shiraishi
Assignee (at issue)
MITSUBISHI CHEMICAL 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.