William F Rothermel, John P Matthews, James W Walker, Wallace H Coulter: Cassette for supporting test tubes of different diameters and/or lengths. Coulter Electronics, Stephen A Roen, Gerald R Hibnick, August 13, 1985: US04534465 (78 worldwide citation)

A stackable cassette or rack for supporting a plurality of sealed sample containers having different diameters and/or lengths and transporting the same to a testing station of a hematology analyzer device. The cassette comprises a body having a top and a bottom and a rear portion, and the body inclu ...

Robert E Auer: Method of and apparatus for detecting change in the breakoff point in a droplet generation system. Coulter Corporation, Stephen A Roen, Gerald R Hibnick, December 11, 1984: US04487320 (70 worldwide citation)

A particle separator for sorting particles suspended in a liquid according to certain characteristics, including a method of and apparatus for detecting a change in the droplet breakoff point of a liquid jet stream which is subjected to vibrations. The vibrations produce amplitude undulations on the ...

Rossa W Cole, Anthony Leto: Low BTU gas combustor. Curtiss Wright Corporation, Stephen A Roen, Arthur L Frederick, August 23, 1983: US04399652 (60 worldwide citation)

A combustion chamber for burning low BTU fuel comprising a generally cylindrical casing having adjacent outer and inner annular spaces defined by outer, intermediate and inner walls, the spaces intercommunicating at the downstream end of the casing thereby providing a U-shaped flow path. The outer a ...

Stephen A Roen: Solar powered portable calculator. Litton Business Systems, Stephen A Roen, Norman Friedman, Robert F Rotella, April 12, 1977: US04017725 (45 worldwide citation)

A portable calculator utilizing a solar panel array which can be either slidably moved within the calculator's housing or pivotly connected to it and which when exposed to incident light provide power for the calculator.


Stephen Warhaftig: Thoracic lumbar sacral orthosis support system. Skil Care, Stephen A Roen, October 15, 1996: US05564788 (26 worldwide citation)

A support system for maintaining a person in a substantially upright sitting position in a wheelchair, comprises a unitary frame and a unitary cushion. The unitary frame has front and back portions, and a generally rectangularly shaped central portion having upper and lower sections. A pair of upper ...

Andre LeMay: Screen partition assembly. Standard Desk, Robert F Rotella, Norman Friedman, Stephen A Roen, October 26, 1976: US03987836 (26 worldwide citation)

A modular screen partition system includes a mounting post containing inserts which permit the joining of any desired number of partitions to the post while permitting complete angular orientation capability in a light- and sound-proof assembly. The inserts, located within the top and bottom interio ...

David Morris: Latch circuit. Litton Business Systems, Stephen A Roen, Norman Friedman, Robert F Rotella, October 26, 1976: US03988643 (22 worldwide citation)

A Schmidt trigger voltage regulator having a latching circuit at its input to disable the regulator during an overload condition and automatically resets the latching circuit when the overload condition is removed thereby allowing the regulator to function in its normal voltage regulating mode.

Daniel E Johnson: Method of prestressing the working surfaces of pressure chambers or cylinders. Metal Improvement Company, Stephen A Roen, Arthur L Frederick, October 19, 1982: US04354371 (20 worldwide citation)

A method of prestressing the working surface of pressure chambers or cylinders comprising the steps of first shot peening their working surfaces to form compressive residual stresses, and then applying fluid pressure at a predetermined magnitude to cause tensile stresses in the working surfaces. The ...

Raul I Pedroso, Robert S Coulter: Microsample handling apparatus. Coulter Corporation, Stephen A Roen, Gerald R Hibnick, May 14, 1985: US04516437 (19 worldwide citation)

Method of and apparatus for handling a microsample comprising a probe for aspirating a sample and a cleaning mechanism having a passageway within which the probe is movable. The passageway has a cleaning chamber having opposite ends, one end being open to the atmosphere and proximate the sample. The ...