Company Filing History:
3 out of 4 
2 out of 481 
Years Active: 2020-2025
Title: Nobuaki Okajima: Innovator in Metal Recovery Technologies
Introduction
Nobuaki Okajima is a prominent inventor based in Hitachi, Japan, known for his significant contributions to the field of metal recovery technologies. With a total of 5 patents to his name, Okajima has focused on developing methods that enhance the efficiency of recovering valuable metals from waste materials, particularly in the context of lithium-ion batteries.
Latest Patents
Okajima's latest patents include innovative methods for recovering valuable metals such as cobalt and nickel from acidic solutions derived from waste materials. One notable patent describes a comprehensive method for recovering cobalt from an acidic solution obtained from waste containing positive electrode materials for lithium-ion secondary batteries. This method involves a two-step extraction process that utilizes solvent extraction techniques to efficiently recover cobalt ions. Another significant patent outlines a processing method for positive electrode active substance waste, which includes steps such as carbon mixing, roasting, and acid leaching to extract valuable metals from the waste.
Career Highlights
Throughout his career, Nobuaki Okajima has worked with notable companies in the metal recovery sector, including JX Metals Circular Solutions Co., Ltd. and JX Nippon Mining & Metals Corporation. His work has been instrumental in advancing technologies that contribute to sustainable practices in metal recovery and recycling.
Collaborations
Okajima has collaborated with esteemed colleagues in his field, including Shojiro Usui and Kazunori Tajiri. These collaborations have further enriched his research and development efforts, leading to innovative solutions in metal recovery.
Conclusion
Nobuaki Okajima stands out as a key figure in the innovation of metal recovery technologies, with a focus on sustainability and efficiency. His patents and career achievements reflect his commitment to advancing the field and addressing the challenges associated with waste materials.