Granted Patent
Utility
US 4,731,454 · App. 07/055,380
Process for producing lactams
Inventors:
Masayuki Otake, Isamu Fukushima
Patented Case
View Patent ↗
Granted: Mar 15, 1988
Filed: May 29, 1987
Inventors
Masayuki Otake
Isamu Fukushima
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.