Temperature controlled cartridge heater
Patent 3947656 Issued on March 30, 1976. Estimated Expiration Date: 
March 30, 1993. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
March 30, 1993. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 2777931 3113198 3305820 3360693 3519795 3614387 3678247 InventorAssigneeApplicationNo. 500565 filed on 08/26/1974US Classes:219/243, Combined with pressure application means156/515, Cutting element simultaneously bonds (e.g., cut seaming)219/241, With thermal control means219/482, With power supply and voltage or current regulation or current control means219/505, Comprising nonlinear or negative temperature coefficient resistance means338/238, Element inpowdered insulation with outer metallic sheath392/498With thermostatic control meansExaminersPrimary: Albritton, C. L.AbstractA temperature controlled electric heater for severing a web of vinyl film, which includes a metallic sheath having internal heater elements arranged in a ceramic core and has a thermistor nested in the core and in surface contact with the sheath for sensing the temperature of the heater, the sheath being adapted to heat sever the vinyl film web on contact therewith.Field of SearchCombined with pressure application meansWith thermal control means With temperature or current control means Housing, casing, or support insertable into material or space to be heated (e.g., immersion type) Rigid tubular housing, casing, or support (e.g., flattened tube) With heating unit structure With protective means for heater With power supply and voltage or current regulation or current control means With heat storage or transfer means | |
