William B Tait

US Patent:

46685073, May 26, 1987

Filed:

Nov 7, 1985

Appl. No.:

6/796354

Inventors:

David A. Tomkins - Racine WI
William S. Tait - Racine WI
Donald J. Duda - Kenosha WI

Assignee:

S. C. Johnson & Son, Inc. - Racine WI

International Classification:

A61L 904
C23F 1100

US Classification:

424 45

Abstract:

A corrosion resistant insecticidal composition for use in aerosol containers includes an organophosphorous pesticide, an emulsifier, an aerosol propellant, an aqueous carrier and as a corrosion inhibiting system, an organic corrosion inhibitor and an inorganic corrosion inhibitor.

US Patent:

43953182, Jul 26, 1983

Filed:

Jan 15, 1982

Appl. No.:

6/339527

Inventors:

William S. Tait - Racine WI
Richard L. Martin - St. Louis MO
Richard A. Rodgers - St. Louis MO

Assignee:

Petrolite Corporation - St. Louis MO

International Classification:

G01N 2730
G01N 2746

US Classification:

204404

Abstract:

Test, auxiliary and reference electrodes are immersed in a corrodant fluid. The test electrode is cathodically polarized by a cathodic polarization circuit. Peak current flow in the auxiliary electrode is measured and a linear cathodic polarization function is generated by a computer circuit. The test electrode is forwardly and reversely anodically polarized by an anodic polarization circuit. A comparator circuit senses the voltage of the test electrode with respect to the auxiliary electrode during reverse anodic polarization and compares this value to the cathodic polarization function. When the test electrode voltage and cathodic polarization function are equal, an anodic memory circuit stores the value of the current passing through the test electrode. This current is the pitting current which is converted into pitting rate.