Granted Patent
Utility
US 4,362,937 · App. 06/210,391
Alpha-ray radiation source photographing device
Inventor:
Katsuaki Nakajima
Patented Case
View Patent ↗
Granted: Dec 7, 1982
Filed: Nov 25, 1980
Inventor
Katsuaki Nakajima
Assignee (at issue)
Doryokuro Kakunenryo Kaihatsu Jigyodan
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.