US 12,313,297 B2
Thin-walled tube heater for fluid
Jerry Wayne Smith, Irvine, KY (US); and Makoto Aoki, Ishikawa (JP)
Assigned to LEXMARK INTERNATIONAL, INC., Lexington, KY (US)
Filed by LEXMARK INTERNATIONAL, INC., Lexington, KY (US)
Filed on Jan. 26, 2021, as Appl. No. 17/158,255.
Claims priority of provisional application 62/966,083, filed on Jan. 27, 2020.
Prior Publication US 2021/0235549 A1, Jul. 29, 2021
Int. Cl. F24H 1/14 (2022.01); B32B 15/01 (2006.01); C23C 4/08 (2016.01); C23C 4/131 (2016.01); F24H 1/10 (2022.01); F24H 3/00 (2022.01); F24H 9/1818 (2022.01); F24H 9/1863 (2022.01); H05B 3/48 (2006.01)
CPC F24H 1/142 (2013.01) [C23C 4/08 (2013.01); C23C 4/131 (2016.01); F24H 1/102 (2013.01); F24H 3/002 (2013.01); F24H 9/1827 (2013.01); F24H 9/1872 (2013.01); H05B 3/48 (2013.01); B32B 15/017 (2013.01); B32B 2250/04 (2013.01); B32B 2307/302 (2013.01); B32B 2307/304 (2013.01); B32B 2311/09 (2013.01); B32B 2311/24 (2013.01); B32B 2311/30 (2013.01); B32B 2315/08 (2013.01); F24H 2250/02 (2013.01); H05B 2203/013 (2013.01); H05B 2203/017 (2013.01); H05B 2203/021 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A method of making a tube heater for heating a fluid in an interior of the tube heater, comprising:
providing a stainless steel core;
circumferentially printing a resistive layer on the stainless steel core including electrically insulating the resistive layer with first and second glass layers, one of the glass layers having a thermal conductivity of more than 2 W/mK and the other of the glass layers having a thermal conductivity of less than or equal to 0.5 W/mK;
dimpling an inner surface of the stainless steel core; and
providing and sealing inside pluralities of balls in an interior of the stainless steel core.