The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 27, 2025
Filed:
Jan. 26, 2021
Lexmark International, Inc., Lexington, KY (US);
Jerry Wayne Smith, Irvine, KY (US);
Makoto Aoki, Ishikawa, JP;
LEXMARK INTERNATIONAL, INC., Lexington, KY (US);
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.