Longmont, CO, United States of America

Charles A Campbell

This inventor holds 1 USPTO granted patent. Top assignee: International Business Machines Corporation. Active years: 1976.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Charles A Campbell. Retrieved from https://idiyas.com/inventor/charles-a-campbell-wo4is3b1

Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile

Calculating rank

% Patents Active = 100.0

Average Co-Inventor Count = 4.0

ph-index = 1

Forward Citations = 31(Granted Patents)


Company Filing History:


Years Active: 1976

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1 patent (USPTO):Explore Patents

Title: **Charles A. Campbell: Innovator in Magnetic Brush Development**

Introduction

Charles A. Campbell is a notable inventor based in Longmont, CO, recognized for his innovative contributions to the field of magnetic brush development. With one patent to his name, Campbell has made a significant impact in enhancing the efficiency of developer mixes in printing technology.

Latest Patents

Campbell's key patent is titled "Magnetic Brush Developer," which showcases an advanced design of an auger-fed magnetic brush developer. This system employs two parallel augers that continuously recirculate the developer mix, enriching it with toner before returning it to the magnetic brush roll. The supply auger is designed to communicate with the brush roll along its entire length, effectively elevating the mix for optimal performance. The unique four-flute arrangement of the auger guarantees a uniform supply of mixture and provides it to the brush roll at strategically controlled intervals, ensuring quality enhancement of the developer mix.

Career Highlights

Charles A. Campbell's career is highlighted by his time at International Business Machines Corporation (IBM), where he has demonstrated his innovative prowess. His patent has improved the triboelectric agitation in developer mixes, employing dual augers that operate at different speeds for balanced flow, fundamentally advancing the technology in this area.

Collaborations

Throughout his career, Campbell has worked alongside notable colleagues such as Jerry J. Abbott and Allison H. Caudill. His collaborations underline the importance of teamwork in innovation, bringing together diverse skills and insights to achieve groundbreaking advancements in technology.

Conclusion

In conclusion, Charles A. Campbell stands out as a significant figure in the innovation landscape of magnetic brush development. His inventive approach and dedication to enhancing printing technology through his patented designs reflect the ongoing evolution within this critical field. His contributions, along with those of his colleagues at IBM, continue to shape the future of printing and imaging technology.

Profile summary based on public USPTO records.
Data Sources: USPTO Patent Grant XML, Patent Center, EPO & CIPO • Normalized by IDiyas Innovation Graph. Methodology & provenance architecturePlease report any incorrect information to [email protected]
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