THIN-WALLED TUBE HEATER FOR FLUID
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United States of America Patent
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Issued Date -
Jul 29, 2021
app pub date -
Jan 26, 2021
filing date -
Jan 27, 2020
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Abstract
A tube heater for heating a fluid in an interior of the tube has a stainless steel cylindrical core. The core ranges about 3 to 300 mm in length and about 100 to 200 microns in thickness with an outer diameter of about 8 to 20 mm. An inner surface of the core has dimples and a conductive coating. A patterned resistive layer overlies the core in a thickness of about 9 to 15 microns. The resistive layer is thin- or thick-film printed about a circumference of the core. Two glass layers surround the resistive layer. Each glass layer is electrically insulative. The glass underlying the resistive layer has a thermal conductivity of more than 2 W/mK while the glass overlying the resistive layer has a thermal conductivity of less than or equal to 0.5 W/mK.
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