Company Filing History:
Years Active: 1977-1991
Title: The Innovations of John E. Callan
Introduction
John E. Callan is a notable inventor based in Milwaukee, Wisconsin, recognized for his contributions to programmable controller technology. With a total of eight patents to his name, Callan has made significant advancements in the field of digital control systems. His work has been instrumental in enhancing the efficiency and functionality of programmable controllers.
Latest Patents
One of Callan's latest patents is the "Programmable Controller Module Rack with a Relative Rack Slot Addressing." This invention involves a programmable controller that includes multiple equipment racks with slots for processor and input/output modules. Each rack features a backplane that interconnects the modules and carries slot address signals for efficient access by the processor module. The design allows for a daisy chain connection of backplanes, enabling a streamlined addressing system that is adaptable to various rack positions.
Another significant patent is the "Optically Coupled Input Circuit for Digital Control." This invention converts a sensed alternating current (a.c.) voltage into a logic level voltage. It utilizes a rectifier to transform the a.c. voltage into a direct current (d.c.) voltage, which is then supplied to an optical isolator. The circuit includes switchable low and high impedance paths that manage the light emitter's conductivity based on the sensed a.c. input voltage, ensuring reliable operation.
Career Highlights
John E. Callan is currently employed at Allen-Bradley Company, LLC, where he continues to innovate in the field of automation and control systems. His work at Allen-Bradley has positioned him as a key player in the development of advanced programmable controllers.
Collaborations
Throughout his career, Callan has collaborated with notable colleagues, including Anthony Gerard Gibart and Kazuaki Kume. These partnerships have fostered a creative environment that has led to the development of groundbreaking technologies in the industry.
Conclusion
John E. Callan's contributions to the field of programmable controllers and digital control systems have made a lasting impact on the industry. His innovative patents and collaborative efforts continue to shape the future of automation technology.
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