Granted Patent
Utility
US 5,072,021 · App. 07/467,300
Optically active naphthalene derivatives
Inventors:
Masakatsu Nakatsuka, Tsutomu Nishizawa
Patented Case
View Patent ↗
Granted: Dec 10, 1991
Filed: Jan 16, 1990
Inventors
Masakatsu Nakatsuka
Tsutomu Nishizawa
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.