Gte Sylvania Incorporated

Norman A Mathieu

Ronald E Edin

Edward D Parent

Ernest A Davey

Philip G Aberizk

Ruth G Petersen

Electric heater

An elongated electrical heating element comprises intertwisted helical strands of metal wire. Some of the strands extend the full length of the heating element and other strands extend predetermined shorter distances to provide two or more zones having differing electric resistances and therefore differing operating temperatures.

Electrical heating element

In an evaporation source for the vacuum deposition of sublimating material, the evaporant surrounds, and is spaced from, an axially disposed coiled tungsten heater. The evaporated material passes out of the source in an upward direction to deposit on a substrate located above the source.

Evaporation source

Growing community of inventors

Exeter, NH, United States of America

Norman A Mathieu