Granted Patent
Utility
US 4,319,054 · App. 06/213,900
Process for producing pyrogallol
Inventors:
Takao Maki, Kenji Murayama
Patented Case
View Patent ↗
Granted: Mar 9, 1982
Filed: Dec 8, 1980
Inventors
Takao Maki
Kenji Murayama
Assignee (at issue)
Mitsubishi Chemical 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.