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:
Aug. 26, 2003
Filed:
Apr. 30, 2002
E. Mikhail Sagal, Warwick, RI (US);
Cool Options, Inc. a New Hampshire corp., Warwick, RI (US);
Abstract
An electric heater element, that is injection overmolded with a thermally conductive polymer having a thermal conductivity of at least 3 W/m° K, includes surface enhancements to increase the overall outer surface area of the element that is in contact with a fluid to be heated, thereby enhancing the efficiency of heat transfer into the fluid. The heater element has a solid core having a resistance heating element spirally wound about its outer surface. An outer covering is injection overmolded onto the core sealing the heating element and shielding it from the exterior environment. While the outer covering seals the heating element it also includes surface enhancements such as concentric fins, pins or discs that increase the contact surface area of the outer cover, further enhancing the heat transfer properties of the heating element. The outer cover is injection molded from a thermally conductive polymer material that has a coefficient of thermal expansion that is matched with that of the remaining materials to reduce the potential of thermal stress cracks during operation of the finished product. Further, the present invention includes the method of manufacturing the heating element as described herein.