Global Patent Index - EP 1001655 A2

EP 1001655 A2 2000-05-17 - Heater with PTC and fixed resistance elements

Title (en)

Heater with PTC and fixed resistance elements

Title (de)

Heizelement versehen mit PTC und feststehenden Widerstandelemente

Title (fr)

Elément de chauffage constitué d'éléments PTC et résistifs fixés

Publication

EP 1001655 A2 (EN)

Application

EP 99308933 A

Priority

US 18938298 A

Abstract (en)

A heater (10) includes a relatively fixed resistance heating element (14) for providing a greater heating rate at lower ambient temperatures and/or high heat transfer environments. The heater further includes a relatively variable resistance heating PTC (positive temperature coefficient) element (23, 25) which has a resistance which increases in response to increased temperature, thereby providing self-regulation by way of reduced heat at increased temperatures. The relatively fixed (14) and variable resistance heating elements (23, 25) are typically provided on opposite sides of a heating pad (12), but may be separated by a dielectric layer (26) and both formed on a single side of the heating pad (12). <IMAGE>

IPC 1-7 (main, further and additional classification)

H05B 3/34

IPC 8 full level (invention and additional information)

H01C 7/02 (2006.01); H05B 3/00 (2006.01); H05B 3/14 (2006.01); H05B 3/34 (2006.01); H05B 3/84 (2006.01)

CPC (invention and additional information)

H05B 3/14 (2013.01); H05B 3/146 (2013.01); H05B 3/34 (2013.01); H05B 3/845 (2013.01); H05B 2203/003 (2013.01); H05B 2203/006 (2013.01); H05B 2203/011 (2013.01); H05B 2203/013 (2013.01); H05B 2203/02 (2013.01)

Designated contracting state (EPC)

AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE

EPO simple patent family

EP 1001655 A2 20000517; AU 5832199 A 20000525; BR 9907538 A 20000822; CA 2289142 A1 20000509; JP 2000150114 A 20000530; KR 20000035181 A 20000626

INPADOC legal status


2000-07-19 [18W] WITHDRAWN

- Date of withdrawal: 20000519

2000-05-17 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: A2

- Designated State(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE

2000-05-17 [AX] REQUEST FOR EXTENSION OF THE EUROPEAN PATENT TO

- Free text: AL;LT;LV;MK;RO;SI