Electrically heated bedcover

• US 3,222,497 A
• Filed: 04/30/1963
• Issued: 12/07/1965
• Est. Priority Date: 04/30/1963
• Status: Expired due to Term

• Current Assignee: Walter H. Gordon Jr
• Original Assignee: Walter H. Gordon Jr
• Inventors: Gordon, Walter H. Jr.
• Application Number:
  US04/276,931
• Time in Patent Office: 952 Days
• US Class Current: 219/212
• CPC Class Codes: H05B 1/0213 using bimetallic elements
• CPC Class Codes: H05B 2203/003 using serpentine layout
• CPC Class Codes: H05B 2203/014 Heaters using resistive wires or cables not provided for in H05B3/54
• CPC Class Codes: H05B 2203/016 Heaters using particular connecting means
• CPC Class Codes: H05B 2203/017 Manufacturing methods or apparatus for heaters
• CPC Class Codes: H05B 2203/033 Heater including particular mechanical reinforcing means
• CPC Class Codes: H05B 3/342 heaters used in textiles

Claims

1. AN ELECTRICALLY HEATED BEDCOVER COMPRISING:

(A) A FABRIC BLANKET SHELL;

(B) AN ELECTRIC HEATER DISTRIBUTED OVER SAID SHELL TO PROVIDE AN ELECTRICALLY HEATED AREA;

(C) TEMPERATURE SENSOR EXTENDING OVER THE ENTIRE HEATED AREA OF SAID SHELL INDEPENDENTLY OF SAID HEATER AND IN A PATTENT TO SENSE ANY ABNORMALLY HIGH TEMPERATURE OF ANY PORTION OF SAID HEATER, SAID TEMPERATURE SENSOR INCLUDING A PAIR OF LOW RESISTANCE CONDUCTORS IN CLOSELY SPACED RELATED SEPARATED BY AN INSULATING MATERIAL COMPRISING A BASIC PLASTIC COMPOUND AND AN IONIC ADDITIVE THEREBY TO PROVIDE A CONTINUOUS FLEXIBLE LAYER BETWEEN SAID CONDUCTORS WHICH IS ESSENTIALLY AN INSULATOR AT NORMAL OPERATING TEMPERATURES AND CONDUCTS CURRENTS OF CONTROL MAGNITUDE AT TEMPERATURES ABOVE NORMAL;

(D) AND A CONTROL SYSTEM TO DE-ENERGIZE SAID ELECTRIC HEATER RESPONSIVE TO TEMPERATURE SENSITIVE CURRENT FLOW THROUGH ANY PORTION OF THE LAYER OF SAID TEMPERATURE SENSOR.