John E Campbell

Title: Innovations by John E Campbell

Introduction

John E Campbell is an accomplished inventor based in Brookline, MA (US). He has made significant contributions to the field of temperature control technology, particularly in the agricultural sector. With a total of 2 patents, Campbell's work focuses on enhancing the efficiency and reliability of temperature monitoring systems.

Latest Patents

One of Campbell's latest patents is a sophisticated thermostat designed to monitor and control the temperature of produce ripening within an enclosure. This innovative device features a bridge circuit that senses errors between the actual and desired temperatures. The desired temperature can be selected directly in units of degrees. A bridge amplifier with feedback maintains the bridge in electrical balance, preventing errors caused by changes in the self-heating of bridge components. An error detection circuit allows for the simultaneous selection of upper and lower error limits centered on the desired temperature. This circuit indicates whenever the actual temperature deviates from these limits. Additionally, an alarm circuit alerts users to temperature errors or power failures both at the thermostat and at a remote location. This system utilizes an alternating current source to activate current direction-dependent indicators operating on alternate half cycles. Furthermore, electrical isolation of the temperature monitoring circuitry from the heating, cooling, and fan equipment is achieved by coupling a signal indicating a temperature error through a single electrically isolating interface to the equipment selection and control circuitry at line potential.

Career Highlights

John E Campbell is currently associated with United Brands Company, where he continues to innovate and develop advanced temperature control solutions. His expertise in this area has positioned him as a key figure in the industry.

Collaborations

Campbell collaborates with Paul R Hughes, leveraging their combined knowledge and skills to further enhance their contributions to temperature control technology.

Conclusion

John E Campbell's innovative work in thermostat technology demonstrates his commitment to improving agricultural practices through effective temperature management. His patents reflect a deep understanding of the complexities involved in temperature control, making him a notable inventor in this field.