Granted Patent
Utility
US 4,355,898 · App. 06/152,714
Optical detecting, monitoring or measuring arrangements
Inventor:
John P. Dakin
Patented Case
View Patent ↗
Granted: Oct 26, 1982
Filed: May 23, 1980
Inventor
John P. Dakin
Assignee (at issue)
Plessey Overseas Limited
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.