Patent ID: 7002114
Filing Date: 2006-02-21
Classification: A61L,G05D,H05B

Abstract:
1. A vapor delivery system for dispensing a vaporized material having a controllable heating apparatus comprising: a heating element; a voltage source coupled to said heating element; a variable resistor coupled to said heating element and said voltage source, said variable resistor including a fixed resistive element and a moveable element, said moveable element having a position and adjustably contacting said fixed resistive element at a contact point associated with said position; said fixed resistive element having a length and comprising a first thin film resistor and a second thin film resistor substantially parallel to said first thin film resistor, said first and second thin film resistors having a width that varies non-linearly over said length said variable resistor having a resistance that is at least partially non-linearly related to said position; said heating element having a dissipated power that is at least partially linearly related to said position, said dissipated power at least partially linearly related to a temperature of said heating element.