ALEXANDER E LAWSON
Engineers in Mendham, NJ

4215564, Aug 5, 1980

Feb 6, 1979

6/009949

Alexander E. Lawson - Mendham NJ
Robert J. Mathieu - Mountain Lakes NJ

Gow-Mac Instrument Co. - Bound Brook NJ

G01N 2500

73 27R

A hot wire miniaturized thermal conductivity detector with a cavity volume less than 50 microliters characterized by a construction which provides for essentially plug flow through a cylindrical cavity. The gas flows tangentially into and out of toroidal passageways presented between axial filament mounts and the cylindrical cell wall so that the gas flow-passage area increases by stages as the gas flows from an inlet into the detector cavity first through the toroidal passageways therein then through the main body thereof. Correspondingly the flow path decreases by stages from the main body into the toroidal passageway then into the outlet. Preferably the passage area increase from inlet to main body is held to less than a five fold increase in area.

4275304, Jun 23, 1981

Sep 5, 1979

6/072685

Alexander E. Lawson - Mendham NJ
Robert J. Mathieu - Mountain Lakes NJ
James M. Miller - Madison NJ

GOW-MAC Instrument Co. - Bound Brook NJ

G01J 142

250373

An improvement in analytic instruments which measure liquid properties by optical techniques, the improvement providing an optical path through the liquid under test as low as about 0. 1 mm by presence of a flat transparent surface across the optical beam and by flowing a film of the liquid under test down the surface, the depth of the film being the optical path through the liquid. Desirably the surface is normal to the beam, but at an acute angle to horizontal. A matted surface is desirable for spreading high viscosity solvents across the surface.

4042304, Aug 16, 1977

Nov 6, 1972

5/304096

Archer J. P. Martin - Elstree, EN
James M. Miller - Madison NJ
Robert J. Mathieu - Mountain Lakes NJ
Alexander E. Lawson - Mendham NJ

GOW-MAC Instruments, Inc. - Madison NJ

G01N 2146

356128

A detector used in apparatus for measuring variations in the composition of a liquid includes a cell utilizing the Christiansen effect on light transmitted by the liquid flowing through the cell filled with particulate matter. The liquid and the particulate matter have indices of refraction that are substantially equal to one another at a specific wavelength. Variations of the transmitted light can determine changes of the refractive index of the liquid. Differences in the intensity of light transmitted through a sample cell and a reference device can be determined.