Granted Patent
Utility
US 4,820,647 · App. 06/937,307
Method for detecting a metal ion in an aqueous environment
Inventor:
Ian Gibbons
Patented Case
View Patent ↗
Granted: Apr 11, 1989
Filed: Dec 3, 1986
Inventor
Ian Gibbons
Assignee (at issue)
Biotrack, LLC
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.