Granted Patent
Utility
US 4,680,369 · App. 06/843,222
Sulfur-containing polyurethane base lens resin
Inventors:
Nobuyuki Kajimoto, Akihiro Tamaki, Teruyuki Nagata
Patented Case
View Patent ↗
Granted: Jul 14, 1987
Filed: Mar 24, 1986
Inventors
Nobuyuki Kajimoto
Akihiro Tamaki
Teruyuki Nagata
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.