公开(公告)号：US20220264704A1

公开(公告)日：2022-08-18

申请号：US17597545

申请日：2019-07-17

Applicant: 3M INNOVATIVE PROPERTIES COMPANY

Inventor： Ruixuan He ,  Cameron E. Derry ,  Ranjith Divigalpitiya ,  Paolo Rocca

IPC: H05B3/28 ,  B05D7/24 ,  B05D7/04 ,  B05D3/12 ,  H05B3/14

Abstract: An electrical film heater having a variable thermal output is described herein. The electrothermal film heater comprises a substrate having first and second major surfaces that is characterized by a length and a width. A nonuniform graphite coating layer is disposed on at least one major surface of the substrate creating a variable electrical resistance coating on the substrate along at least one of the length and/or the width of the substrate, and a pair of spaced apart bus bars disposed on top of the graphite coating layer.