Granted Patent
Utility
US 4,283,570 · App. 06/115,704
Process for preparing resorcinol
Inventors:
Hiroaki Nakagawa, Noriyuki Hirowatari, Takayuki Nakamura
Patented Case
View Patent ↗
Granted: Aug 11, 1981
Filed: Jan 28, 1980
Inventors
Hiroaki Nakagawa
Noriyuki Hirowatari
Takayuki Nakamura
Assignee (at issue)
Mitsui Petrochemical Industries, Ltd.
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.