The Dow Chemical Company

Stephen W Barr

Selim Yalvac

Robert A Bredeweg

Jeffrey Robert Larson

E Deniz Yalvac

P Richard Stoesser

A chemical sensor and method for in-line chemical analysis including a body having a central cavity. The body also has a pair of openings through it to the cavity. A porous plug, such as a ceramic frit, is sealed into each of these openings so that there is a space between the plugs in the cavity. A vent passageway through the body to the cavity is also provided. A pressurized sample is flowed through one porous plug into the cavity while a pressurized reagent is flowed through the other porous plug into the cavity. A component of interest of the sample reacts with a reactive component of the reagent in the cavity to produce a reaction product. The reaction product is analyzed in the cavity by, for example, absorption spectroscopy. As fresh sample and reagent flow into the cavity, the reaction products flow out of the cavity by way of the vent passageway. An ultrasonic vibrator is attached to the body to enhance mixing of the reagent and sample in the cavity

Chemical sensor

A detergent package having a cap of a given volume is described. The package has an indicator strip adapted to undergo a physical change upon contact with a sample of water. The physical change is visually perceptible and indicative of the amount of detergent necessary to effectively launder clothes in the water. The amount of detergent indicated by the indicator strip is expressed as a multiple of the volume of the cap. The use of the package is also described.

Detergent package for laundering clothes

A flow programmer for gas chromatography of the type having a mass flow meter for controlling the flow rate of a gas chromatography carrier gas controllable at a selected carrier gas flow rate program by an electrical input to the mass flow meter and an electrical circuit for generating the electrical input. The improvement is that the electrical circuit for generating the electrical input is an analog electrical circuit which includes an operational amplifier having an electrical capacitor in the feedback loop of the operational amplifier to produce a selected voltage input program.

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Midland, MI, United States of America

Stephen W Barr