Sumitomo Heavy Industries, Ltd.

Sumitomo (shi) Cryogenics of America, Inc.

Shi-apd Cryogenics, Inc.

Sumitomo (shi) Cryogenic of America, Inc.

John Borchers

Ralph C Longsworth

Stephen Dunn

Gary S Ash

Paul Nickelsberg

An expansion engine operating on a Brayton cycle which is part of a system for producing refrigeration at cryogenic temperatures that includes a compressor, a counter-flow heat exchanger, and a load that may be remote, which is cooled by gas circulating from the engine. The engine has a piston in a cylinder which has nearly the same pressure above and below the piston while it is moving. Low pressure on a piston drive stem provides a force imbalance to move the piston towards the warm end.

Gas balanced cryogenic expansion engine

A direct current voltage to heat the sensor wire for powering and extracting a signal voltage from a thermocouple-type vacuum sensor. The direct current used produces a DC offset in the sensor output where the heating current flow is stopped for a short interval and the unbiased sensor voltage is then sampled and stored.

Interrupted DC operation of thermocouple vacuum gauge

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Allentown, PA, United States of America

John Borchers