Takayuki Ikai

This inventor holds 11 USPTO granted patents and 3 published patent applications, plus 1 CIPO patent and 1 EPO patent. Top assignees: Mitsubishi Pencil Company, Limited, Mitsubishi Pencil Kabushiki Kaisha. Active years: 1999-2026.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Takayuki Ikai. Retrieved from https://idiyas.com/inventor/takayuki-ikai

Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile

USPTO Granted Patents = 11 (Patent Applications = 3)

% Patents Active = 72.7

CIPO Patents = 1

EPO Patents = 1 (Patent Applications = 5)

Average Co-Inventor Count = 1.9

ph-index = 3

Forward Citations = 37(Granted Patents)

Location History:

Yokohama, JP (1999 - 2021)
Shinagawa-ku, JP (2023)
Tokyo, JP (2024)

Company Filing History:

8 out of 395

Mitsubishi Pencil Company, Limited

patents

3 out of 196

Mitsubishi Pencil Kabushiki Kaisha

patents

Years Active: 1999-2026

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11 patents (USPTO):Sort by Forward CitationsExplore Patents

1. 12559637 - Coloring tablet and water-based ink composition for writing instrument using the same (2026-02-24),

2. 12054622 - Oil-based ink composition for writing utensils, writing utensil using same, and airbrush unit using same (2024-08-06),

3. 11654711 - Writing tool provided with refill (2023-05-23),

4. 11135868 - Refill for writing implements and writing implements using the same (2021-10-05),

5. 10569596 - Writing tool refill and writing tool using same (2020-02-25),

6. 7381754 - Oil-based ink composition and uses thereof (2008-06-03),

7. 7311459 - Follower for non-aqueous ball point pen and non-aqueous ball point pen (2007-12-25),

8. 6945726 - Refill for oil-based ink ballpoint pen and oil-based ink ballpoint pen (2005-09-20),

9. 6830611 - Oil-base ink composition, writing utensils and dyes to be used therein (2004-12-14),

10. 6441061 - Additive for oil-based ink for a ball point pen and oil based ink for a ball point pen containing the same (2002-08-27),

11. 5942027 - Ink for ball point pen (1999-08-24),

Title: Takayuki Ikai: Innovator in Writing Utensils

Introduction

Takayuki Ikai is a prominent inventor based in Yokohama, Japan. He has made significant contributions to the field of writing utensils, holding a total of 11 patents. His innovative designs and formulations have enhanced the functionality and performance of writing tools.

Latest Patents

Among his latest patents are an oil-based ink composition for writing utensils, a writing utensil using the same, and an airbrush unit utilizing this composition. The oil-based ink composition is designed to provide excellent writing properties on various surfaces while improving scratch resistance. This composition includes an aluminum pigment, a colorant, a resin, an organic solvent, and polydimethylsiloxane with specific polyether-modifying groups. Additionally, he has developed a writing tool featuring a refill with a straight cylindrical ink reservoir tube, which minimizes the risk of ink leakage during refill replacement.

Career Highlights

Takayuki Ikai has worked with notable companies such as Mitsubishi Pencil Company, Limited and Mitsubishi Pencil Kabushiki Kaisha. His experience in these organizations has allowed him to refine his skills and contribute to the development of innovative writing instruments.

Collaborations

Throughout his career, Ikai has collaborated with talented individuals, including Shuuji Ichikawa and Misao Oyama. These partnerships have fostered creativity and innovation in his projects.

Conclusion

Takayuki Ikai's contributions to the writing utensil industry demonstrate his commitment to innovation and quality. His patents reflect a deep understanding of materials and design, making him a significant figure in the field.

Profile summary based on public USPTO records.