Granted Patent
Utility
US 4,658,276 · App. 06/872,865
Phthalide derivatives and recording system utilizing the same
Inventors:
Nobuo Kanda, Tetsuro Horiike, Mitsuru Kondo
Patented Case
View Patent ↗
Granted: Apr 14, 1987
Filed: Jun 11, 1986
Inventors
Nobuo Kanda
Tetsuro Horiike
Mitsuru Kondo
Assignee (at issue)
Kanzaki Paper Manufacturing Co., 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.