Company Filing History:
Years Active: 1992-2002
Title: The Innovations of David Francis Howell
Introduction
David Francis Howell is a notable inventor based in Maidenhead, GB. He has made significant contributions to the field of electronic switching devices and field emission devices, holding a total of two patents. His work has had a profound impact on high-frequency switching performance and amplification technologies.
Latest Patents
One of Howell's latest patents is for electronic switching devices. This high-speed field emission vacuum switching device features a cathode tip formed on a substrate, an extraction grid positioned close to the cathode tip, and a modulator grid spaced from the cathode tip by a dielectric layer. The grids are designed with apertures aligned with the cathode tip, and an anode is spaced from the modulator grid by another dielectric layer. The use of the modulator grid allows for substantial improvements in high-frequency switching performance. Additionally, a collector grid may be included between the extraction grid and the modulator grid, along with a cut-off grid positioned between the modulator and collector grids.
Another significant patent by Howell involves field emission devices. This klystron device consists of an array of cold-cathode field emission elements arranged to form a distributed amplifier. The device further includes a modulation strip line and a catcher strip line, with a collector electrode spaced from the catcher strip line. Notably, the device may also feature a deflector that returns electrons emitted by the elements back to the modulation strip line, enabling the device to function as an oscillator.
Career Highlights
Throughout his career, David Francis Howell has worked with prominent companies such as General Electric Company and GEC-Marconi Limited. His experience in these organizations has contributed to his expertise in the field of electronic devices and innovations.
Collaborations
Howell has collaborated with various professionals in his field, including Neil A Cade, enhancing the scope and impact of his inventions.
Conclusion
David Francis Howell's contributions to electronic switching and field emission technologies demonstrate his innovative spirit and technical expertise. His patents reflect a commitment to advancing technology and improving performance in electronic devices.