Granted Patent
Utility
US 4,320,969 · App. 06/075,781
Method and assembly for measuring equivalent sphere illumination in the field
Inventor:
John Green
Patented Case
View Patent ↗
Granted: Mar 23, 1982
Filed: Sep 17, 1979
Inventor
John Green
Assignee (at issue)
Manville Service Corporation
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.