Company Filing History:
Years Active: 1977-1978
Title: Innovations of John A. Stephens
Introduction
John A. Stephens is a notable inventor based in Tucson, Arizona. He has made significant contributions to the field of chemical engineering, particularly in the area of copper recovery processes. With a total of two patents to his name, his work has had a considerable impact on the industry.
Latest Patents
John A. Stephens' latest patents focus on the sulfidization reaction process. This innovative method involves sulfidizing an acid copper leach pulp prior to flotation recovery of copper. The process includes adding an ionizable sulfide material to the pulp in a reaction zone. The sulfide material is added in proportion to the amount of copper passing through the zone, ensuring that the sulfidization reaction is completed within approximately 30 seconds. The resulting pulp has an aqueous copper concentration ranging from about 0.014 to 0.024 grams per liter. Additionally, the reactor designed for this process features elongated tubular means, shaft means mounted within the tubular structure, and a series of blade members attached to the shaft. These blades are strategically spaced at approximately 30-degree pitch angles relative to the axial direction of the shaft, with certain blades having a reverse pitch direction at predetermined distances along the shaft's length.
Career Highlights
John A. Stephens is associated with The Anaconda Company, where he has applied his expertise in chemical processes. His work has contributed to advancements in copper recovery techniques, enhancing efficiency and effectiveness in the industry.
Collaborations
Throughout his career, John has collaborated with notable colleagues, including Martin C. Kuhn and Michael J. Noakes. These partnerships have fostered innovation and development in their shared field of expertise.
Conclusion
John A. Stephens is a distinguished inventor whose contributions to the field of copper recovery have been significant. His innovative sulfidization reaction process exemplifies his commitment to advancing chemical engineering practices. His work continues to influence the industry positively.