Patent ID: 9422849
Filing Date: 2016-08-23
CPC Classification: F01N,H05B,Y02A,Y02T

Claim Text:
1. A reservoir to hold a quantity of fluid within a tank, said reservoir comprising: a first resistive element to electrically heat a first part of a tank, said first resistive element positioned outside said reservoir; a second element to electrically heat a second part of said tank, said second element positioned inside said reservoir, said second element having a positive temperature coefficient; and a third resistive element to electrically heat said second part of said tank, said third resistive element positioned inside said reservoir, said second element and said first resistive element forming a parallel circuit, and said third resistive element being connected in series with said parallel circuit, wherein said reservoir is mounted inside said tank, wherein at a first time corresponding to a start the heating, the second element has a first resistance so as to dissipate a first power within the reservoir, and wherein at a later second time the second element has a second resistance so as to dissipate a second power within the reservoir, the second power being lower than the first power so that a total power dissipated in the tank is lower at the second time than at the first time.