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:
Jul. 20, 1976
Filed:
Dec. 05, 1974
Joseph A Volk, Jr, Florissant, MO (US);
Beta Corporation of St. Louis, Bridgeton, MO (US);
Abstract
An electric heater having a ceramic core with a heating element surrounding the core and a jacket surrounding the heating element such that the heating element is secured to the jacket but there is no chemical bonding between the heating element and the core. In the method of producing the electric heater, the core is formed in an uncured state and then surrounded with the heating element. The heating element is surrounded by a jacket such that the heating element is secured to the jacket, and the core is thereafter cured. In producing an article such as the core of the heater from a thermosetting type material, the material is preheated to within a range so as to soften the material sufficiently for injection into a mold. The mold is preheated to a temperature sufficient to cure the material after injection into the mold. The material is then injected into the mold and the injection pressure thereafter released while keeping the mold clamped together for a time after release of the injection pressure, and thereafter the mold is unclamped and the article is removed from the mold.