Rainin Instrument Co., Inc.

Altex Scientific, Inc.

Roy P Moeller

Haakon T Magnussen

Haakon T Magnussen, Jr

Kenneth Rainin

Gary L Smith

Carl L Schackelford

Phillip S Palmer

A method and accompanying apparatus for automatically extending the linear dynamic absorbance range of absorbance detectors including multi-lightpath flow cells. The absorbance of a reference beam in a relatively short reference path is multiplied by a ratio of the absorbance of a sample beam in a relatively long sample path to the reference path absorbance in developing a relative absorbance for the sample path beyond its linear dynamic range.

Method and apparatus for extending the linear dynamic range of

A compact high performance absorbance detector including a flashlamp light source and folded optics system with ruled grating reflecting beam splitter for minimizing flash to flash angular pattern and spectral variations of the flashlamp.

High performance absorbance detector with flashlamp and compact folded

A liquid chromatography system mixing chamber having a motor-driven magnet situated beside an interior compartment wherein one or more stirring magnets are disposed for mixing solvents fed to the mixing chamber by appropriate metering pumps. A fitting is provided having an expandable ring seal, the fitting being insertable into the interior compartment for effecting a high-pressure seal for preventing leakage of the solvent mixture, while enabling access to the interior of the mixing chamber for maintenance purposes without the need for a tool.

Solvent mixing chamber for a liquid chromatography system

A system for depassivating a passivated lithium battery in a battery powered microprocessor controlled device by successively and momentarily drawing current from the passivated battery after a turn on of the device while monitoring the power delivery condition of the battery under a load condition until salt crystals on an electrode of the battery are dissipated and the battery is returned to a useful power delivery condition or until a predetermined period of time has elapsed without the battery returning to the useful power delivery condition, whichever is sooner.

System and method for depassivating a passivated lithium battery in a

A dashpot piston mounted in a closed chamber is coupled by an axially movable shaft to a pipette piston to regulate return movement of the pipette piston within a pipette cylinder to draw fluid into the cylinder. The dashpot shaft is movable within limits relative to the dashpot piston to accommodate a blow-out of residual fluid from the pipette by the shaft driving the pipette piston beyond a home position to blow residual fluid from the pipette cylinder. An air inlet port in the bottom of the chamber allows air to be drawn into the chamber with upward movement of the dashpot piston while a valve adjacent to the air inlet port opens in response to downward movement of the dashpot piston to exit air from the chamber. Control of the relative sizes of the air inlet port and valve outlet regulates the relative rates of upward and downward piston movement in the cylinder. The dashpot piston carries a movable plate of a variable capacitor transducer for monitoring the position of the pipette piston within the pipette cylinder.

Pipette mechanism

A decoder for pulse width modulated (PWM) signals comprising an integrator and a sample-and-hold circuit wherein the sample-and-hold output signal is fed back to the input of the integrator. No periodic initialization of the integrator is required. The gains of the integrator and sample-and-hold circuits and the capacitance of the integrator capacitor affect only the settling time of the decoder, not the value to which the decoder output ultimately settles.

Pulse width modulation decoder

A spectrophotometer utilizing a multiple wavelength electromagnetic wave source which is intercepted and dispersed into a spectrum. The spectrophotometer includes a closed loop servo positioning mechanism for simultaneously directing selected portions of the electromagnetic spectrum to a detector which analyzes these portions of the spectrum for analytical purposes.

Growing community of inventors

Hayward, CA, United States of America

Roy P Moeller