The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 16, 2002
Filed:
Mar. 18, 1998
John W. Foerster, Millersville, MD (US);
Kenneth Ewing, Crofton, MD (US);
Angela Ervin, Crofton, MD (US);
Robert Lamontagne, Bethesda, MD (US);
The United States of America as represented by the Secretary of the Navy, Washington, DC (US);
Abstract
A method for determining copper (I) concentrations in water or seawater samples. In the method a probe is dipped into the sample for a time sufficient to produce a color change, removed and compared to a color standard to determine the concentration. The probe includes a substrate and an impregnate, bathocuproine, which complexes to copper (I) to produce a colored complex that is not toxic or less toxic to marine organisms than copper (I). The substrate is an ionomeric polymer having hydrophobic chains with hydrophilic cation exchange cites. In a preferred embodiment the substrate is a sulfonated perfluoropolymer.