Granted Patent
Utility
US 5,393,464 · App. 08/146,900
Biodegradable corrosion inhibitors of low toxicity
Inventors:
Richard L. Martin, Jo Ann McMahon, Bernardus A. Oude Alink
Patented Case
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Granted: Feb 28, 1995
Filed: Nov 2, 1993
Inventors
Richard L. Martin
Jo Ann McMahon
Bernardus A. Oude Alink
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.