Granted Patent
Utility
US 4,894,475 · App. 07/138,076
Alpha-acyloxyketone derivatives
Inventors:
Hiroaki Tan, Koji Kato, Junichi Imuta, Noriaki Kihara
Patented Case
View Patent ↗
Granted: Jan 16, 1990
Filed: Dec 28, 1987
Inventors
Hiroaki Tan
Koji Kato
Junichi Imuta
Noriaki Kihara
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.