This inventor holds 12 USPTO granted patents. Top assignees: Tokyo Electron Limited, Advanced Technology Materials, Inc., Ppt Technologies, LLC. Active years: 1998-2008.
Company Filing History:
6 out of 10,862 
2 out of 622 
2 out of 3 
Years Active: 1998-2008
Title: **William H. Mullee: Innovator in Semiconductor Cleaning and Chemical Purity**
Introduction
William H. Mullee, an esteemed inventor based in Portland, OR, has made significant contributions to the field of chemical engineering and semiconductor technology. With a robust portfolio of 12 patents, he has continuously pushed the boundaries of innovation in his area of expertise.
Latest Patents
Among his notable inventions, two patents stand out for their impact on industry practices. The first, "Purification of Organic Solvent Fluids," presents a chemical distribution system designed to enhance the purity and consistency of organic solvents. This invention features a vessel containing ion-exchange media strategically placed within the fluid flow pathway. The organic solvent fluid passes through this media, effectively removing undesirable impurities. The system includes a return chemical flow pathway, allowing for incremental adjustments in solvent purity until reaching the desired level.
The second patent, "Removal of CMP and Post-CMP Residue from Semiconductors Using Supercritical Carbon Dioxide Process," introduces a novel method for cleaning residual CMP (Chemical Mechanical Polishing) materials from semiconductor surfaces. This method involves placing the object within a pressurized chamber, where supercritical carbon dioxide is utilized to eliminate CMP residues effectively. Following the process, the chamber is vented, ensuring a thorough cleaning.
Career Highlights
William has worked with prominent companies in the technology sector, including Tokyo Electron Limited and Advanced Technology Materials, Inc. His expertise has been instrumental in advancing cleaning technologies and chemical distribution systems critical to semiconductor manufacturing.
Collaborations
Throughout his career, William has collaborated with industry professionals such as Marc De Leeuwe and Glenn A. Roberson, Jr. These partnerships have fostered a creative environment that has led to groundbreaking inventions and enhanced industry standards.
Conclusion
William H. Mullee's contributions to the fields of chemical purity and semiconductor cleaning demonstrate his commitment to innovative solutions that address critical industry needs. His inventions continue to influence the practices of companies aiming for excellence in chemical processes.