Company Filing History:
Years Active: 1985-1987
Title: David E Witter: Innovator in Silicon Technology
Introduction
David E Witter is a notable inventor based in Richardson, TX (US). He has made significant contributions to the field of silicon technology, holding a total of 4 patents. His work focuses on innovative processes that enhance the production and purification of silicon materials.
Latest Patents
One of Witter's latest patents is titled "Deposition of silicon at temperatures above its melting point." In this invention, liquid silicon is deposited on a high surface area column of silicon nitride particles through hydrogen decomposition of trichlorosilane. This process occurs in an environment heated to a temperature exceeding the melting point of silicon. After deposition, the liquid silicon flows by gravity to a collection point. A liquid transfer system is designed to move the silicon directly to a crystal pulling operation, which conserves energy and allows for the continual withdrawal of melt from the reactor. This immediate pulling not only provides additional purification but also ensures that the crystal pulled is used as feedstock for a final crystal pulling operation.
Another significant patent by Witter is the "Process for producing crystalline silicon spheres." In this invention, silicon spheres are fabricated by applying a slurry of metallurgical grade silicon on a substrate that can maintain integrity beyond the melting point of silicon. The metallurgical grade silicon is patterned to create regions of uniform size. The substrate and silicon are then heated beyond the melting point, causing the silicon to bead and form spheres due to its high cohesion. After cooling, the silicon spheres crystallize and are removed for further processing.
Career Highlights
David E Witter is currently associated with Texas Instruments Corporation, where he continues to innovate in the field of silicon technology. His work has had a profound impact on the efficiency and effectiveness of silicon production processes.
Collaborations
Witter has collaborated with notable colleagues such as Mohendra S Bawa and Jules D Levine, contributing to advancements in their shared field of expertise.
Conclusion
David E Witter's contributions to silicon technology through his innovative patents and collaborations highlight his role as a leading inventor in this domain. His work continues to influence the industry and pave the way for future advancements.