Company Filing History:
1 out of 10 
1 out of 219 
Years Active: 1990-1992
Title: Sean A Johnson: Innovator in N-Methyl-2-Pyrrolidone Analysis
Introduction
Sean A Johnson is a notable inventor based in Chino, California, with a focus on innovative methods for chemical analysis. He holds two patents that showcase his expertise in the determination of N-methyl-2-pyrrolidone (NMP) content in various materials. His work has significant implications for quality control in manufacturing processes.
Latest Patents
Johnson's latest patents include a method for the accurate quantitative determination of reactive and non-reactive N-methyl-2-pyrrolidone volatiles in graphite-polyimide prepreg samples. This method involves heating prepreg samples in a containment chamber, flushing volatiles with dry nitrogen gas, and analyzing the composition via gas chromatography. The method is designed for routine quality control situations and ensures high accuracy through an internal check on collection efficiency. Additionally, he has developed a condensing apparatus for gas chromatography measurements, which is compact, lightweight, and capable of withstanding extreme temperatures and aggressive solvents. This apparatus simplifies maintenance and cleaning, making it a valuable tool in the field.
Career Highlights
Throughout his career, Sean A Johnson has worked with prominent companies such as General Dynamics Corporation and its Air Defense Systems Division, as well as the Pomona Division of General Dynamics Corp. His experience in these organizations has contributed to his innovative approach to chemical analysis.
Collaborations
Johnson has collaborated with notable coworkers, including Nancy K Roberts and Richard P Lutz, Jr. Their combined expertise has likely enhanced the development of his patented methods and apparatus.
Conclusion
Sean A Johnson's contributions to the field of chemical analysis, particularly regarding N-methyl-2-pyrrolidone, demonstrate his innovative spirit and commitment to quality control in manufacturing. His patents reflect a significant advancement in the methods used for determining chemical content in various materials.