Company Filing History:
8 out of 2,637 
1 out of 832,843 Years Active: 2015-2025
Title: Innovations of Inventor Kai Hay Kwok
Introduction
Kai Hay Kwok is a notable inventor based in Thousand Oaks, California. He has made significant contributions to the field of electronics, particularly in the development of bipolar transistors. With a total of nine patents to his name, Kwok's work has advanced the technology used in power amplifiers and other electronic devices.
Latest Patents
Among his latest patents, one is titled "Bipolar transistor having collector with doping concentration grading." This invention relates to bipolar transistors, such as heterojunction bipolar transistors, which feature increased collector thickness for improved ruggedness. In some embodiments, the collector thickness can exceed 1.1 microns. The design includes at least one doping concentration grading, with a high doping concentration at the junction between the collector and the sub-collector. This high doping concentration can be above about 9×10 cm. Additionally, the collector may have a region with high doping concentration adjacent to the base and a discontinuity in the doping concentration at the low end of the grading. Such bipolar transistors can be effectively implemented in power amplifiers.
Another patent by Kwok is titled "Bipolar transistor having collector with doping concentration discontinuity." Similar to the previous patent, this invention also focuses on bipolar transistors with increased collector thickness for enhanced ruggedness. The specifications regarding collector thickness, doping concentration, and implementation in power amplifiers are consistent with his earlier work.
Career Highlights
Throughout his career, Kai Hay Kwok has worked with prominent companies, including Skyworks Solutions, Inc. His experience in the industry has allowed him to refine his inventions and contribute to advancements in electronic technology.
Collaborations
Kwok has collaborated with notable professionals in his field, including Peter J. Zampardi and Cristian Cismaru. These collaborations have likely enriched his work and led to innovative solutions in electronics.
Conclusion
Kai Hay Kwok's contributions to the field of bipolar transistors demonstrate his innovative spirit and technical expertise. His patents reflect a commitment to improving electronic devices, particularly in enhancing their performance and reliability.