Granted Patent
Utility
US 6,212,009 · App. 09/308,855
Phase annulus to carry out a positive phase contrast
Inventors:
Sabine Alt-Nedvidek, Claus Gunkel
Patented Case
View Patent ↗
Granted: Apr 3, 2001
Filed: Nov 12, 1999
Inventors
Sabine Alt-Nedvidek
Claus Gunkel
Assignee (at issue)
Leica Microsystems Wetzlar GmbH
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.