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For the Inventor, By the Inventor

Takasago, Japan

Hirokazu Tsukahara

This inventor holds 14 USPTO granted patents. Top assignee: Mitsubishi Paper Mills Limited. Active years: 1976-1993.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Hirokazu Tsukahara. Retrieved from https://idiyas.com/inventor/hirokazu-tsukahara

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

USPTO Granted Patents = 14

% Patents Active = 100.0

Average Co-Inventor Count = 2.6

ph-index = 5

Forward Citations = 74(Granted Patents)


Location History:

  • Kyoto, JA (1976)
  • Takasago, JP (1981 - 1985)
  • Kanamachi, JP (1988 - 1989)
  • Ushiku, JP (1992)
  • Tokyo, JP (1987 - 1993)

Company Filing History:

goldMedal14 out of 622 
 
Mitsubishi Paper Mills Limited
 patents

Years Active: 1976-1993

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14 patents (USPTO):Explore Patents
1. 5252393 - Thermal delayed-tack adhesive compositions and thermal delayed-tack (1993-10-12),
2. 5112797 - Donor sheet for pressure-sensitive image recording (1992-05-12),
3. 4833023 - Thermal delayed tack sheets (1989-05-23),
4. 4775417 - Color developer (1988-10-04),
5. 4745026 - Thermal delayed tack sheets (1988-05-17),
6. 4737587 - Colorless carbazole dyes for recording materials (1988-04-12),
7. 4711749 - Process for producing microcapsules (1987-12-08),
8. 4550328 - Image-receiving color-forming sheet for transfer electrophotography (1985-10-29),
9. 4327148 - Self-contained color forming pressure sensitive record paper of the (1982-04-27),
10. 4296948 - Color-developing sheet for no-carbon copying process (1981-10-27),
11. 4291102 - Desensitizer for no-carbon copy paper (1981-09-22),
12. 4268634 - Desensitizer for no-carbon copy paper (1981-05-19),
13. 3963779 - Novel organic photoconductive compound (1976-06-15),
14. 3932182 - An organic photoconductive composition comprising an organic (1976-01-13),

Title: Hirokazu Tsukahara: Innovator in Thermal Adhesive Technologies

Introduction

Hirokazu Tsukahara is a prominent inventor based in Takasago, Japan. He has made significant contributions to the field of adhesive technologies, holding a total of 14 patents. His innovative work focuses on thermal delayed-tack adhesive compositions, which have practical applications in various industries.

Latest Patents

Tsukahara's latest patents include advancements in thermal delayed-tack adhesive compositions. These compositions are designed to be non-adhesive at ordinary temperatures but can be activated and tackified when heated. They maintain their tackiness for an extended period, even after being separated from a heat source. Additionally, he has developed thermal delayed tack sheets that prevent blocking or sticking when wound into rolls or superimposed. His work also includes a donor sheet for pressure-sensitive image recording, which allows for the formation of high-density, high-resolution images on receptor sheets.

Career Highlights

Hirokazu Tsukahara is associated with Mitsubishi Paper Mills Limited, where he has been instrumental in developing innovative adhesive solutions. His expertise in polymer resins and tackifiers has led to advancements that benefit various applications in the adhesive industry.

Collaborations

Tsukahara has collaborated with notable colleagues, including Nobuhiro Kagota and Mitsuru Fuchigami. Their combined efforts have contributed to the success of various projects and innovations within the company.

Conclusion

Hirokazu Tsukahara's work in thermal adhesive technologies showcases his commitment to innovation and excellence. His patents reflect a deep understanding of material science and practical applications, making him a valuable contributor to the field.

Profile summary based on public USPTO records.
Data Sources: USPTO Patent Grant XML, Patent Center, EPO & CIPO • Normalized by IDiyas Innovation Graph. Methodology & provenance architecturePlease report any incorrect information to [email protected]
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