초록 ▼

An electrical heater including a semi-conductor pattern (e.g., colloidal graphite ink) printed on a substrate. A conductive ink (e.g., a silver ink) is deposited on the semi-conductor pattern. The conductive ink migrates into the semi-conductor material, provides a superior electrical contact betwee

An electrical heater including a semi-conductor pattern (e.g., colloidal graphite ink) printed on a substrate. A conductive ink (e.g., a silver ink) is deposited on the semi-conductor pattern. The conductive ink migrates into the semi-conductor material, provides a superior electrical contact between the conductor (e.g., the silver ink) and the underlying semi-conductor material (e.g., the semi-conductor graphite ink), and essentially eliminates interface resistance. In some embodiments, the semi-conductor pattern is printed on one side of a woven cloth substrate and the conductive ink is printed on the other side.

대표청구항 ▼

An electrical heating device comprising: (a) a substrate having at least one electrically insulating surface; (b) a semi-conductor pattern comprising a semi-conductor ink deposited on said electrically insulating surface, said pattern including a pair of spaced-apart conductor contact portions and a

An electrical heating device comprising: (a) a substrate having at least one electrically insulating surface; (b) a semi-conductor pattern comprising a semi-conductor ink deposited on said electrically insulating surface, said pattern including a pair of spaced-apart conductor contact portions and a heating portion extending between and electrically connected to said conductor contact portions; and, (c) a pair of conductors, each of said conductors having a resistance less than that of said heating and conductor contact portions and being in direct electrical engagement with one of said conductor contact portions, said heating device being characterized in that each of said conductors comprises a conductive ink deposited in registration with said conductor contact portions after said semi-conductor ink has been deposited on said substrate to provide said semi-conductor pattern, and in that said conductive ink migrates into said conductor contact portions.