Company Filing History:
Years Active: 1982-1993
Title: The Innovative Contributions of Donald L. Stewart
Introduction
Donald L. Stewart is a notable inventor based in Greensburg, PA (US). He has made significant contributions to the field of aluminum processing, holding a total of 4 patents. His work focuses on improving processes related to the treatment of aluminum dross, which is a byproduct of aluminum production.
Latest Patents
One of his latest patents is titled "Process for the removal of salts from aluminum dross." This innovative process involves treating salt-containing aluminum dross to effectively remove potassium and sodium chloride salts. The method includes a two-step leaching process, where the first step utilizes a leaching solution with a pH maintained between 6 and 7. This step removes a portion of the salt content. The residual solids are then filtered, and the filtered solids undergo a second treatment with a leaching solution that has a pH above 8, preferably above 9. The pH levels are controlled by adding hydrochloric acid in the first step and potassium or sodium hydroxide in the second step.
Another significant patent is the "Salt-based melting process," which further enhances the efficiency of aluminum processing.
Career Highlights
Donald L. Stewart is associated with the Aluminum Company of America, where he applies his expertise in aluminum processing. His innovative approaches have contributed to advancements in the industry, making processes more efficient and environmentally friendly.
Collaborations
Throughout his career, Stewart has collaborated with notable colleagues, including Roger C. Johnson and Utah Tsao. These collaborations have fostered a creative environment that encourages innovation and the development of new technologies.
Conclusion
Donald L. Stewart's contributions to aluminum processing through his patents and collaborative efforts highlight his role as a significant inventor in the field. His innovative processes not only improve efficiency but also address environmental concerns associated with aluminum production.