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Kohjin Co., Ltd.

USPTO Granted Patents = 60

% Expired Patents = 1.7

CIPO Patents = 12

Trademarks = 6

Forward Citations = 550

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137 inventors (with patents filed for the assignee):

Tomoji Mizutani (8 out of 8 patents)

Hideo Isozaki (8 out of 8 patents)

Yoshikazu Kubota (4 out of 4 patents)

4. Hiroshi Oka (4 out of 4 patents)

5. Hideaki Mukohyama (4 out of 4 patents)

6. Takashi Kamiya (3 out of 31 patents)

7. Hisashi Kojoh (3 out of 3 patents)

8. Naoya Yamaguchi (3 out of 3 patents)

9. Jiro Suzuki (3 out of 3 patents)

10. Yoshihiro Sakamoto (3 out of 3 patents)

11. Masumi Takahashi (3 out of 3 patents)

12. Makoto Hirata (3 out of 3 patents)

13. Motonobu Ichino (3 out of 3 patents)

14. Tokuro Nakamura (3 out of 3 patents)

15. Motoyasu Saito (3 out of 3 patents)

Core Competencies:

Heat Shrinkable Film

Polyamide Film

Food Packaging

Water Absorbing Polymer

Sweetness Improving Agent

Thermal Recording Sheet

Decorative Laminates

Dewatering Agent

Biaxially Oriented Film

Enteric Coating Liquid

Adhesive Materials

Composite Fiber

60 patents: Sort by Forward Citations

1. 9084435 - Yeast mutant and yeast extract (2015-07-21),

2. 7140855 - Inner mandrel (2006-11-28),

3. 6855360 - Sweetness improving agent and foods containing the same (2005-02-15),

4. 6352762 - Easily adhesive polyamide film (2002-03-05),

5. 5968810 - Stress-relieving feed (1999-10-19),

6. 5759675 - Multi-layer stretchable, shrinkable polyethylene film and process for (1998-06-02),

7. 5691049 - Heat shrinkable polyolefin laminate film (1997-11-25),

8. 5672656 - Temperature sensitive water absorbing and discharging polymer composition (1997-09-30),

9. 5667813 - Mandrel for cooling (1997-09-16),

10. 5635286 - Heat shrinkable polyethylene laminate film (1997-06-03),

11. 5620803 - Heat shrinkable polypropylene laminate film (1997-04-15),

12. 5593703 - Mandrel for cooling (1997-01-14),

13. 5587515 - Method of manufacturing N-monosubstituted (meth)acrylamides (1996-12-24),

14. 5573827 - Fine dot-like tone decorative laminates containing pigmented fibers (1996-11-12),

15. 5545467 - Paper additive for hot-pressed forms and hot-pressed forms using it (1996-08-13),

Company Overview

Kohjin Co., Ltd., based in Tokyo, specializes in advanced polymer technology, focusing on the development and manufacturing of a diverse range of products. Their expertise includes heat shrinkable films, polyamide films, and innovative food packaging solutions, catering to various industries. Additionally, the company is known for its water-absorbing polymers, sweetness improving agents, thermal recording sheets, decorative laminates, and dewatering agents, positioning itself as a key player in the polymer sector.

Profile summary synthesized from public USPTO records and patent filings.

Company Badge

USPTO Data Jan 1 1976 - Oct 13 2026

60 Patents

#722 in Tokyo

#1,534 in Japan

#12,083 in the World

Kohjin Co., Ltd.

Forward Citations = 550

137 inventors:

Tomoji Mizutani (8 out of 8 patents)

Hideo Isozaki (8 out of 8 patents)

Yoshikazu Kubota (4 out of 4 patents)

4. Hiroshi Oka (4 out of 4 patents)

5. Hideaki Mukohyama (4 out of 4 patents)

IDiyas Innovation Intelligence. (2026). Company Patent Portfolio: Kohjin Co., Ltd.. Retrieved from https://idiyas.com/company/kohjin-company

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

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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