David R Johnson

Title: Innovations and Contributions of David R Johnson

Introduction

David R Johnson is a notable inventor based in Midland, MI, with a remarkable portfolio of 13 patents. His work primarily focuses on advancements in materials science and engineering, particularly in the development of composite membranes and expandable plastic materials.

Latest Patents

One of Johnson's latest patents is a method of making thin film composite membranes. This innovative method involves creating a semipermeable composite membrane with a discriminating layer formed in situ through interfacial polymerization. The process allows for the removal of a water-immiscible solvent using physical means, such as a water knife or air knife, without requiring a phase change. The resulting composite membranes exhibit excellent flux, high salt rejection, and minimal residual organic solvent.

Another significant patent involves expandable and expanded plastic materials. These materials, which contain a majority of alkyl acrylate monomeric repeat units, achieve a volume expansion of at least 60 and maintain this expansion for a minimum of 30 minutes under specific conditions. The patent also details methods for casting metals using these expanded plastic materials, which lead to superior castings without the need for costly casting methods.

Career Highlights

Throughout his career, David R Johnson has worked with prominent companies, including The Dow Chemical Company and D-H Titanium Company. His experience in these organizations has contributed to his expertise in materials development and innovation.

Collaborations

Johnson has collaborated with notable colleagues such as Norman G Moll and Paul R Juckniess, further enhancing his contributions to the field of materials science.

Conclusion

David R Johnson's innovative work in composite membranes and expandable plastic materials showcases his significant impact on materials science. His patents reflect a commitment to advancing technology and improving industrial processes.