Location History:
- Concord, NH (US) (1984 - 1992)
- Macon, GA (US) (1990 - 1993)
- Dry Branch, GA (US) (1992 - 1998)
- Twiggs, CO (US) (2000)
Company Filing History:
7 out of 356 
3 out of 832,880 Years Active: 1984-2000
Title: Innovations of John M Harrison
Introduction
John M Harrison is a notable inventor based in Macon, GA (US), recognized for his contributions to the field of materials science. He holds a total of 10 patents, showcasing his innovative spirit and dedication to advancing technology.
Latest Patents
Among his latest patents is a precipitated calcium carbonate product that boasts improved brightness. This invention outlines a method for significantly enhancing the brightness and shade properties of high-quality PCC products. The process involves using a calcium-containing feed source with discoloring impurities, which is transformed into an aqueous slurry of calcium carbonate. The slurry undergoes fine screening through a 325 mesh screen to yield a filler grade calcium carbonate slurry. This slurry is then wet milled to liberate discoloring impurities and reduce the median particle size to less than 2 microns. Following this, the impurities are magnetically separated from the slurry, resulting in a purified product with a TAPPI brightness exceeding 96.
Another significant patent involves a coarse particle kaolin clay, characterized by an average Stokes equivalent particle diameter of about 4.5-6.0 microns. This kaolin clay exhibits a BET surface area of approximately 8-11 m²/g and a median Malvern particle size of about 9.0-10.5 microns. The preparation of this clay includes several steps such as blunging, centrifugation, magnetic separation, and chemical leaching, ultimately producing a product with excellent properties for use in thermoset composite materials and industrial coatings.
Career Highlights
Throughout his career, John M Harrison has worked with reputable companies, including J.M. Huber Corporation. His work has significantly impacted the development of materials used in various industries.
Collaborations
John has collaborated with notable individuals in his field, including Gary M Freeman and John J Hassett. These partnerships have contributed to the advancement of his innovative projects.
Conclusion
John M Harrison's contributions to the field of materials science through his patents and collaborations highlight his role as a significant inventor. His work continues to influence the industry and inspire future innovations.