Electric heating – Heating devices – Resistive element: igniter type
Patent
1987-09-14
1989-05-16
Walberg, Teresa J.
Electric heating
Heating devices
Resistive element: igniter type
219273, 219275, H05B 342
Patent
active
048312363
ABSTRACT:
An apparatus for acetone clearing of cellulose or nitrate membrane filters includes an elongated electric heater element with tubing for transporting acetone coiled around said heater element and in contact therewith. Liquid acetone is introduced to said tubing wherein it is heated by said heater element and acetone vapor is discharged from said tubing. The temperature of the coiled tubing is thermostatically controlled. Acetone vapor is removed from said tubing and passed over a glass slide having an exposed filter containing particulars, such as asbestos fibers. The vapors clear the filter to render it translucent for examination in optical microscopy.
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"An Asbestos Sample Filter Clearing Procedure", Paul A. Baron & Gregory Pickford, National Institute for Occupational Safety and Health, 4676 Columbia Parkway, Cincinnati, Ohio 45226.
Delaney Larry R.
Lang Dan H.
Lee Richard J.
Lentz Henry P.
Matone, Jr. Charles J.
RJ Lee Group, Inc.
Walberg Teresa J.
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