(under the class definition) Products and processes wherein the product is silicon or a compound thereof.
(1) Note. Silicon and silicon dioxide are arbitrarily considered to be glass. A process of chemically manufacturing silicon or silicon dioxide combined with significant shaping or heat treatment will be found in either Class 438, Semiconductor Device Manufacturing: Process, or Class 65, Glass Manufacturing.
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588, Hazardous or Toxic Waste Destruction or Containment, appropriate subclasses for the destruction or containment of hazardous or toxic waste containing silicon, oxygen, and metals.
