Granted Patent
Utility
US 4,943,611 · App. 07/224,685
Resin composition for spacers of information recording disc
Inventors:
Akira Todo, Toshio Kimura, Takeshi Minoda, Masayoshi Kurisu
Patented Case
View Patent ↗
Granted: Jul 24, 1990
Filed: Jul 27, 1988
Inventors
Akira Todo
Toshio Kimura
Takeshi Minoda
Masayoshi Kurisu
Assignee (at issue)
Mitsui Petrochemical Industries, 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.