Granted Patent
Utility
US 6,716,951 · App. 10/181,774
Heat-resistant methacrylic copolymers, production process thereof and optical elements
Inventors:
Takao Marutani, Hiroki Hatakeyama, Yoshiko Sano
Patented Case
View Patent ↗
Granted: Apr 6, 2004
Filed: Jul 22, 2002
Inventors
Takao Marutani
Hiroki Hatakeyama
Yoshiko Sano
Assignee (at issue)
MITSUBISHI ELECTRIC 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.