Granted Patent
Utility
US 4,556,902 · App. 06/572,150
System and method for measuring the area and dimensions of apertures in an opaque medium
Inventor:
Frank S. Krufka
Patented Case
View Patent ↗
Granted: Dec 3, 1985
Filed: Jan 19, 1984
Inventor
Frank S. Krufka
Assignee (at issue)
RCA 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.