Company Filing History:
1 out of 58 
1 out of 93 
1 out of 2,542 
Years Active: 1981-2007
Title: The Innovations of Douglas B. MacDonald
Introduction
Douglas B. MacDonald is an accomplished inventor based in Des Plaines, Illinois. He has made significant contributions to the field of exercise and health monitoring through his innovative designs. With a total of 3 patents, MacDonald has demonstrated his expertise and creativity in developing practical solutions for fitness enthusiasts and health-conscious individuals.
Latest Patents
One of MacDonald's latest inventions is a rowing exercise machine. This machine features a unique resistance mechanism that includes a first coupling between two spaced disks, which are resiliently deformable and tensionable in a spiral configuration to resist rotation. Additionally, it has a second coupling that connects one of the disks to a user handle, providing resistance to the movement of the handle and the corresponding movement of the user along a track. Another notable patent is an apparatus and method for measuring heart rate. This device comprises a sensor that generates a signal containing the biopotential signal produced by the heart. The signal is then filtered, amplified, and digitized. A microcomputer autocorrelates the digitized signal, and various signal indication routines scan the autocorrelated output for periodic signals, ultimately selecting a candidate heart rate based on predetermined criteria.
Career Highlights
Throughout his career, Douglas B. MacDonald has worked with prominent companies in the fitness industry, including Life Fitness, LLC and Bally Manufacturing Corporation. His experience in these organizations has allowed him to refine his skills and contribute to the development of innovative fitness solutions.
Collaborations
MacDonald has collaborated with notable individuals in his field, including Donald J. Alexander and Allen J. Fuller. These partnerships have likely enriched his work and led to the creation of impactful inventions.
Conclusion
Douglas B. MacDonald is a notable inventor whose work in exercise equipment and health monitoring has made a significant impact. His innovative patents reflect his dedication to improving fitness and health technology.