This inventor holds 4 USPTO granted patents. Top assignees: Kabushiki Kaisha Toshiba, Toshiba Lighting & Technology Corporation, Sumitomo Cement Co., Ltd.. Active years: 1987-1998.
Location History:
- Yokohama, JP (1987 - 1993)
- Kanagawa-ken, JP (1998)
Company Filing History:
2 out of 53,250 
2 out of 663 
1 out of 35 Years Active: 1987-1998
Title: Keiji Hatakeyama: Innovator in Fluorescent Lamp Technology
Introduction
Keiji Hatakeyama is a notable inventor based in Yokohama, Japan. He has made significant contributions to the field of lighting technology, particularly in the development of fluorescent lamps. With a total of 4 patents to his name, Hatakeyama's work has had a lasting impact on the industry.
Latest Patents
One of his latest patents is for a fluorescent lamp that incorporates both visible and ultraviolet (UV) radiation. This innovative lamp features a light-transmitting envelope and means for generating a discharge within the envelope. The discharge sustaining fill emits ultraviolet rays during operation, while a phosphor layer converts these rays into visible light. The lamp is designed to have a radiant flux ratio of ultraviolet radiation between 5 to 50 percent of the entire radiant flux.
Another significant patent involves a fluorescent lamp with a UV suppressing film and its manufacturing method. This lamp includes a bulb with both an outer and inner surface, containing discharge gas that generates ultraviolet rays. It features a phosphor film with non-uniform thickness on the inner surface and an ultraviolet suppressing film that reduces the intensity of emitted ultraviolet rays. This design aims to create a more uniform light output.
Career Highlights
Throughout his career, Keiji Hatakeyama has worked with prominent companies such as Toshiba Lighting & Technology Corporation and Kabushiki Kaisha Toshiba. His experience in these organizations has allowed him to refine his expertise in lighting technology and contribute to innovative solutions in the field.
Collaborations
Hatakeyama has collaborated with notable coworkers, including Akira Taya and Miho Watanabe. Their combined efforts have led to advancements in fluorescent lamp technology and have furthered the development of efficient lighting solutions.
Conclusion
Keiji Hatakeyama's contributions to fluorescent lamp technology demonstrate his innovative spirit and dedication to improving lighting solutions. His patents reflect a commitment to enhancing both functionality and efficiency in the industry.