Granted Patent
Utility
US 4,610,020 · App. 06/568,778
X-ray mask ring and apparatus for making same
Inventor:
Carlo La Fiandra
Patented Case
View Patent ↗
Granted: Sep 2, 1986
Filed: Jan 6, 1984
Inventor
Carlo La Fiandra
Assignee (at issue)
PerkinElmer, Inc.
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.