Granted Patent
Utility
US 5,283,312 · App. 07/924,454
Mercapto compound, its preparation process, and sulfur-containing urethane resins and lenses using the same
Inventors:
Yoshinobu Kanemura, Katsuyoshi Sasagawa, Seiichi Kobayashi
Patented Case
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Granted: Feb 1, 1994
Filed: Aug 4, 1992
Inventors
Yoshinobu Kanemura
Katsuyoshi Sasagawa
Seiichi Kobayashi
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.