About 2 Trademarks found that are owned by Heraeus Quarzglas Gmbh

quartz glass and translucent fused quartz glass, semifinished quartz tubes, rods, plates and blocks for use in the industrial arts, semifinished quartz products for the manufacture of optical fibers, namely, dielectric rods, jacketing tubes, sleeving tubes, overcladding tubes, substrate tubes, handles and dummy rods

electrically heated industrial ovens