Company Filing History:
Years Active: 1977-1988
Title: Innovations of John M Fruhwald
Introduction
John M Fruhwald is a notable inventor based in Pittsburgh, PA, who has made significant contributions to the field of electronics and gas detection. With a total of four patents to his name, Fruhwald has developed innovative technologies that enhance safety and efficiency in various applications.
Latest Patents
One of his latest inventions is the 4-20 milliampere transmitter. This transmitter circuit is designed to connect to a sensor and generate a 4-20 milliampere signal that is proportional to the sensor's output. It features a first amplifier connected to the sensor, which produces an output voltage that corresponds to the sensor's output voltage. A second amplifier processes the output and controls an output transistor, ensuring that if any critical wire breaks, the output current drops to zero, enhancing safety.
Another significant invention is the trimode gas detection instrument. This device operates in three modes: monitoring combustible gases, oxygen levels, and detecting the displacement of air by unknown gases. It utilizes only two sensors, a combustible gas sensor and an oxygen sensor, allowing users to quickly switch between modes and observe concentration readings effectively.
Career Highlights
Throughout his career, Fruhwald has worked with reputable companies such as Bacharach, Inc. and The Alliance Manufacturing Company, Inc. His experience in these organizations has contributed to his expertise in developing innovative solutions in the field of gas detection and electronic instrumentation.
Collaborations
Fruhwald has collaborated with notable individuals in his field, including James B Russell and James R Zewe. These partnerships have likely fostered an environment of creativity and innovation, leading to the development of his impactful inventions.
Conclusion
John M Fruhwald's contributions to the field of electronics and gas detection through his patents demonstrate his commitment to innovation and safety. His work continues to influence the industry and improve the technologies we rely on today.