E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 43/24 (2006.01) E21B 36/04 (2006.01)
Patent
CA 2264354
A heater is disclosed which comprises an electrical insulating material surrounding an annular heating element configuration; wherein there is no casing surrounding an annular heating element configuration.
Bielamowicz Lawrence James
de Rouffignac Eric
Vinegar Harold J.
Wellington Scott Lee
Shell Canada Limited
Smart & Biggar
LandOfFree
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