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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.:

US 5925572 B1

PDFFull Text
Date of Patent:
Jul. 20, 1999

Filed:

Aug. 06, 1997

Apparatus and method for in situ ph measurement of aqueous medium

Applicant:
Inventors:

Robert H Byrne, St. Petersburg, FL (US);

Robert D Waterbury, Palm Harbor, FL (US);

John J Kelly, Clearwater, FL (US);

Bram Leader, Clearwater, FL (US);

Randy Russell, Safety Harbor, FL (US);

Charles W Jones, Seminole, FL (US);

Joseph R Kolesar, Pinellas Park, FL (US);

Sean McElligott, Bryn Mawr, PA (US);

Assignee:

University of South Florida, Tampa, FL (US);

Attorney:

Allen, Dyer, Doppelt, Milbrath & Gilchrist, P.A.

Primary Examiner:

Joseph W Drodge

Int. Cl.
CPC ...
G01N / ; G01N / ;
U.S. Cl.
CPC ...
436163 ; 324438 ; 356319 ; 36452802 ; 422 55 ; 422 8209 ; 436164 ;
Abstract

A pH sensor based upon spectrophotometric techniques has been developed for in situ analysis of an aqueous medium, e.g., surface seawater. This sensor utilizes a spectrophotometric pH indicator (Thymol Blue), which has been calibrated for use in seawater as a function of temperature and salinity. Shipboard spectrophotometric pH analyses routinely demonstrate a precision on the order of .+-.0.0004 pH units. In situ analysis of seawater pH has demonstrated a precision on the order of .+-.0.001 and an accuracy, using shipboard measurements as a standard, on the order of .+-.0.01. The sensor is a self-contained system that pumps seawater, meters in indicator, and spectrophotometrically determines indicator absorbance cells, each with three wavelength channels, to obtain the spectrophotometric absorbance. The sensor system, rated for depths up to 500 m, provides pH, conductivity, and temperature and can be operated via computer or in a standalone mode with internal data storage. The sensor utilizes less than 12 watts of power and is packaged in an aluminum housing.

Find Patent Forward Citations

Byrne, Robert. (1999). Apparatus and method for in situ ph measurement of aqueous medium (U.S. Patent No. 5925572). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/5925572

Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile

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