Granted Patent
Utility
US 5,374,668 · App. 08/150,536
Casting epoxy resin, polythiol and releasing agent to form lens
Inventors:
Yoshinobu Kanemura, Katsuyoshi Sasagawa, Masao Imai
Patented Case
View Patent ↗
Granted: Dec 20, 1994
Filed: Nov 8, 1993
Inventors
Yoshinobu Kanemura
Katsuyoshi Sasagawa
Masao Imai
Assignee (at issue)
Mitsui Toatsu Chemicals, Incorporated
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.