Location History:
- Fullerton, CA (US) (1987)
- San Ramon, CA (US) (2004 - 2005)
Company Filing History:
1 out of 2,457 
1 out of 1 
1 out of 1,860 Years Active: 1987-2005
Title: Innovations of Keh-Jim Dunn in Nuclear Magnetic Resonance Technology
Introduction
Keh-Jim Dunn is an accomplished inventor based in San Ramon, CA (US). He holds a total of 3 patents that contribute significantly to the field of nuclear magnetic resonance (NMR) technology. His work focuses on methods that enhance the understanding of porous media and the properties of fluids within them.
Latest Patents
One of his notable patents is a method for obtaining multi-dimensional proton density distributions from a system of nuclear spins. This invention provides a systematic approach to acquire NMR data from fluids containing porous media. By employing a multi-dimensional inversion algorithm, Dunn's method simplifies the mathematical complexities involved in deriving a proton density distribution. The technique utilizes a series of conventional CPMG pulse sequences to excite the nuclear spins, ultimately leading to a smoother density distribution through a regression method that optimizes computational efforts.
Another significant patent involves methods of decoupling diffusion effects from relaxation times to determine properties of porous media. This innovative approach employs novel pulse sequences to probe the characteristics of subterranean formations and core samples. By applying a series of pulse sequences with varying echo spacings, Dunn's method allows for the visualization of properties such as internal field gradients and diffusion coefficients in a two-dimensional map. This technique can also determine essential properties like porosity, pore size distribution, and permeability.
Career Highlights
Throughout his career, Keh-Jim Dunn has worked with prominent companies, including Chevron U.S.A. Inc. and ChevronTexaco U.S.A. Inc. His experience in these organizations has contributed to his expertise in the field of nuclear magnetic resonance and its applications in evaluating porous media.
Collaborations
Dunn has collaborated with various professionals in his field, including his coworker Boqin Q. Sun. Their joint efforts have further advanced the research and development of NMR technologies.
Conclusion
Keh-Jim Dunn's contributions to the field of nuclear magnetic resonance technology are noteworthy. His innovative patents and career experiences reflect his dedication to advancing scientific understanding in this area.