This inventor holds 6 USPTO granted patents. Top assignees: Texas Gas Transmission Corporation, Available Energy Corporation, Other. Active years: 1981-1989.
Company Filing History:
4 out of 20 
1 out of 2 
1 out of 834,350 Years Active: 1981-1989
Title: Innovations of Charles B Leffert
Introduction
Charles B Leffert is a notable inventor based in Troy, MI, who has made significant contributions to the field of measurement technology. With a total of six patents to his name, Leffert's work primarily focuses on ultrasonic instruments designed to measure gas velocity and solids concentration, particularly in the context of coal flow in power generation.
Latest Patents
Leffert's latest patents include an ultrasonic instrument that measures gas velocity and solids. This mass flow meter is specifically adapted for measuring the mass flow rate of finely divided coal being transmitted through conduits, such as those used in large-scale fossil fuel power plants. The invention features several embodiments of transducer assemblies mounted to the conduit, enabling ultrasound pulses to be transmitted and detected. This allows for the evaluation of downstream drift and attenuation of the pulses, which can be correlated to coal concentration and velocity. In one embodiment, a pair of transducers on variable pitch mounts are positioned diametrically opposite each other across the conduit. The transmitting transducer is aimed upstream, while the receiving transducer is aimed downstream to maximize the amplitude output signal. Another embodiment utilizes a pair of transducer linear arrays positioned across the conduit diameter, pulsing discrete elements with a time delay to create a steerable wave front. The received signal is then time delayed to reconstruct the angular wave front.
Career Highlights
Throughout his career, Leffert has worked with Texas Gas Transmission Corporation, where he applied his expertise in measurement technology. His innovative designs have significantly impacted the efficiency and accuracy of coal flow measurement in power generation.
Collaborations
Leffert has collaborated with notable individuals in his field, including Ralph H Kummler and Leo H Weisman. Their combined efforts have contributed to advancements in measurement technology.
Conclusion
Charles B Leffert's contributions to the field of ultrasonic measurement technology have established him as a significant figure in the industry. His innovative patents continue to influence the efficiency of coal flow measurement in power generation.