Location History:
- Gloucester, CA (1988)
- Orleans, CA (1990)
Company Filing History:
Years Active: 1988-1990
Title: John J Zelle: Innovator in Electrical Measurement Technologies
Introduction
John J Zelle is a notable inventor based in Orleans, CA. He has made significant contributions to the field of electrical measurement, holding 2 patents that address critical issues in power meter accuracy. His work focuses on improving the reliability of measurements in various electrical systems.
Latest Patents
One of Zelle's latest patents is an "Instrument to measure the errors of apparent power meters." This innovative instrument is designed to determine, under actual field conditions, which type of VA demand meters are most appropriate for a particular consumer. The electrical load that consumers place on an electrical supply system can introduce harmonics and phase distortion, leading to incorrect readings from VA meters. These meters are intended to measure the true apparent power, defined as S=V.sub.rms XI.sub.rms, but they are generally designed to operate according to approximate formulas.
Another significant patent is the "RMS measuring apparatus for AC/DC voltages." This true RMS instrument utilizes a multijunction thermal converter with two beaters to automatically determine and display the RMS value of an unknown voltage using two steps or modes. In AC mode, the unknown voltage is attenuated and balanced in the thermal converter with a DC voltage, which is stored in digital form in a first latch. In DC mode, the unknown attenuated voltage is replaced by a chopped DC voltage, which is then balanced with the DC voltage obtained in AC mode. The unknown voltage is determined by decoding the contents of a second latch that controls the chopped DC voltage.
Career Highlights
John J Zelle works at Canadian Patents & Development Ltd., where he continues to innovate in the field of electrical measurement. His expertise and inventions have contributed to advancements in the accuracy and reliability of power measurement technologies.
Collaborations
Zelle has collaborated with notable coworkers, including Rejean J Arseneau and Piotr S Filipski. Their combined efforts have furthered the development of innovative solutions in electrical measurement.
Conclusion
John J Zelle's contributions to electrical measurement technologies demonstrate his commitment to innovation and accuracy. His patents reflect a deep understanding of the complexities involved in power measurement, making him a valuable figure in the field.