US 11,791,074 B2
Aluminum nitride heater
Makoto Aoki, Ishikawa (JP); and Jerry Wayne Smith, Irvine, KY (US)
Assigned to LEXMARK INTERNATIONAL, INC., Lexington, KY (US)
Filed by LEXMARK INTERNATIONAL, INC., Lexington, KY (US)
Filed on Feb. 5, 2020, as Appl. No. 16/782,280.
Claims priority of provisional application 62/802,939, filed on Feb. 8, 2019.
Prior Publication US 2020/0260530 A1, Aug. 13, 2020
Int. Cl. H01C 17/30 (2006.01); H05B 3/28 (2006.01); G03G 15/20 (2006.01); H05B 3/02 (2006.01); H05B 3/12 (2006.01)
CPC H01C 17/30 (2013.01) [G03G 15/2039 (2013.01); G03G 15/2057 (2013.01); H05B 3/02 (2013.01); H05B 3/12 (2013.01); H05B 3/283 (2013.01); H05B 2203/01 (2013.01); H05B 2203/013 (2013.01); H05B 2203/017 (2013.01); H05B 2203/02 (2013.01); Y10T 29/49099 (2015.01)] 20 Claims
OG exemplary drawing
 
1. A heater, comprising:
an aluminum nitride base having equal to or less than 1% impurities;
at least one longitudinally extending resistive trace on the aluminum nitride base and a conductor on the aluminum nitride base electrically connected to the at least one resistive trace to apply an external voltage to the at least one resistive trace; and
at least four glass layers overlying the at least one resistive trace, but not an entirety of the conductor.