Granted Patent
Utility
US 5,128,121 · App. 07/585,140
Mixture of a positive and negative contrast agent for magnetic resonance imaging
Inventors:
Arne Berg, Jo Klaveness
Patented Case
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Granted: Jul 7, 1992
Filed: Oct 9, 1990
Inventors
Arne Berg
Jo Klaveness
Assignee (at issue)
Nycomed AS
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.