Company Filing History:
Years Active: 1977
Title: Innovations by David H Meehan
Introduction
David H Meehan is a notable inventor based in Chicago, IL, who has made significant contributions to the field of television technology. With a total of two patents to his name, Meehan has focused on enhancing the safety and performance of cathode ray tube (CRT) display systems.
Latest Patents
Meehan's latest patents include a "Pulse Differentiating High Voltage Shutdown Circuit" and a "High Voltage Shutdown Circuit Responsive to Excessive Beam Current." The first patent describes a television receiver that utilizes a tri-color cathode ray tube display system. It features a high voltage detector that employs a high pass filter to differentiate the horizontal retrace pulse, allowing for the detection of amplitude and duration changes. A diode rectifies the derivative signal, which is then filtered to produce a high voltage error signal. A transistor pair is configured to respond to detected excess high voltage, effectively terminating high voltage generation to ensure safe operation.
The second patent addresses a high voltage shutdown circuit that responds to excesses of high voltage or CRT beam current. This system includes a resistance divider to detect high voltage and a resistor in series with the horizontal deflection transformer to sense beam current. Similar to the first patent, a transistor pair is utilized to load down the operating supply to the horizontal scansion oscillator, thereby terminating high voltage generation when necessary.
Career Highlights
David H Meehan has worked at Zenith Radio Corporation, where he has applied his expertise in electronics and television technology. His innovative designs have contributed to advancements in the safety and reliability of television receivers.
Collaborations
Meehan has collaborated with George J Tzakis, working together to enhance the technology behind CRT display systems.
Conclusion
David H Meehan's contributions to television technology through his patents demonstrate his commitment to innovation and safety in electronic devices. His work continues to influence the industry and improve user experiences with television receivers.