Granted Patent
Utility
US 6,191,423 · App. 09/209,969
Correction device for correcting the spherical aberration in particle-optical apparatus
Inventors:
Marcellinus Krijn, Karel Diederick Van Der Mast
Patented Case
View Patent ↗
Granted: Feb 20, 2001
Filed: Dec 10, 1998
Inventors
Marcellinus Krijn
Karel Diederick Van Der Mast
Assignee (at issue)
Philips Electron Optics
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.