Tokyo, Japan

Hirofumi Hamamoto


Average Co-Inventor Count = 2.7

ph-index = 2

Forward Citations = 7(Granted Patents)


Company Filing History:


Years Active: 1985-1994

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2 patents (USPTO):Explore Patents

Title: The Innovative Journey of Hirofumi Hamamoto

Introduction: Hirofumi Hamamoto, a notable inventor based in Tokyo, Japan, has made significant contributions to the field of product design with his inventive prowess. With a total of two patents to his name, Hamamoto's innovations showcase his dedication to enhancing everyday utility through creative engineering.

Latest Patents: Hamamoto's latest patents reveal his ingenuity in developing practical solutions. One of his patents is an "Applicator having cap which pressurizes inner space." This innovative applicator design allows air to enter the fluid tank, increasing the internal pressure, thereby eliminating the need for users to manually press the fluid tank between their fingers during application. The cap features a valve with a pushing piece, allowing smooth operation as the application ball retracts and engages with the tip of the applicator.

His other notable patent, a "Method for producing a nondirectional pen," outlines a process for creating a pen blank with three or more radial blade sections. This design not only involves drawing a metal pipe but also shaping the pen bodies into a conical form and providing longitudinal slots for functionality. This method results in a pen capable of writing efficiently and effectively.

Career Highlights: Hamamoto's career has been prominently linked with The Sailor Pen Co., Ltd., a reputable company known for high-quality writing instruments. His focus on innovation and design has significantly contributed to the company’s portfolio of unique writing devices.

Collaborations: In his endeavors, Hamamoto has worked alongside talented peers, including Hideshi Okamoto and Kazuhiko Osaki. These collaborations have facilitated a creative environment that encourages the exchange of ideas and spurs further innovation within the company.

Conclusion: Hirofumi Hamamoto stands out as an inventor dedicated to improving user experience through his innovative designs. His work at The Sailor Pen Co., Ltd. reflects a commitment to excellence, and his latest patents embody a blend of practicality and ingenuity, positioning him as an influential figure in the field of writing instruments.

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