Granted Patent
Utility
US 4,469,948 · App. 06/342,696
Composite concentric-gap magnetic lens
Inventors:
Lee H. Veneklasen, William J. DeVore
Patented Case
View Patent ↗
Granted: Sep 4, 1984
Filed: Jan 26, 1982
Inventors
Lee H. Veneklasen
William J. DeVore
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.