Tsutomu Nishizawa

This inventor holds 33 USPTO granted patents, primarily in Optical Recording Media. Top assignees: Mitsui Toatsu Chemicals, Incorporated, Yamamoto Chemicals, Inc.. Active years: 1976-1996.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Tsutomu Nishizawa. Retrieved from https://idiyas.com/inventor/tsutomu-nishizawa

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

USPTO Granted Patents = 33

% Patents Active = 100.0

Average Co-Inventor Count = 4.2

ph-index = 9

Forward Citations = 357(Granted Patents)

Location History:

Kamakura, JA (1976 - 1977)
Kamakura, JP (1981)
Ohmuta, JP (1981 - 1985)
Oomuta, JP (1989)
Yokohama, JP (1985 - 1996)

Company Filing History:

33 out of 1,379

Mitsui Toatsu Chemicals, Incorporated

patents

6 out of 73

Yamamoto Chemicals, Inc.

patents

where one patent can have more than one assignee

Years Active: 1976-1996

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Areas of Expertise:

Optical Recording

Polarizing Film

Electrophotographic

Naphthalocyanine

Colorants

Liquid Crystal

Dichroic Dye

Hydrazones

Color Display

Azo Dyestuffs

Synthetic Materials

Thioindigoid Compounds

33 patents (USPTO):Sort by Forward CitationsExplore Patents

1. 5582774 - Alkylphthalocyanine near-infrared absorbers and recording/display (1996-12-10),

2. 5449587 - Compact disk-write once type optical recording media (1995-09-12),

3. 5446141 - Alkylphthalocyanine near-infrared absorbers and recording/display (1995-08-29),

4. 5382465 - Anthraquinonic colorant and polarizing film containing the colorant (1995-01-17),

5. 5354513 - Polarizing film (1994-10-11),

6. 5286418 - Polarizing film (1994-02-15),

7. 5252769 - Anthraquinonic colorant and polarizing film containing the colorant (1993-10-12),

8. 5235104 - Hydrazones and electrophotographic photoreceptors comprising them (1993-08-10),

9. 5132190 - Hydrozones and electrophotographic photoreceptors comprising them (1992-07-21),

10. 5072021 - Optically active naphthalene derivatives (1991-12-10),

11. 5059356 - Polarizing film (1991-10-22),

12. 5024926 - Alkylphthalocyanine near-infrared absorbers and recording/display (1991-06-18),

13. 5023343 - P-amino substituted tetraphenylthiophenes and electrophotographic (1991-06-11),

14. 4970021 - Phthalocyanine compounds and utility thereof (1990-11-13),

15. 4963449 - P-amino substituted tetraphenylthiophenes and electrophotographic (1990-10-16),

Title: The Innovative Journey of Tsutomu Nishizawa

Introduction

Tsutomu Nishizawa, a prolific inventor hailing from Yokohama, Japan, has made significant contributions to the field of technology with an impressive 33 patents under his name. His dedication to innovation has led to groundbreaking developments in various industries.

Latest Patents

Nishizawa's latest patents showcase his expertise in creating cutting-edge technologies. One notable invention includes Alkylphthalocyanine near-infrared absorbers, which offer exceptional light and thermal resistance. These absorbers, containing phthalocyanine derivatives, find applications in optical recording media, near-infrared absorption filters, and liquid crystal display devices. Another groundbreaking patent is the Compact disk-write once type optical recording media, known for its high sensitivity, low recording distortion, and durability.

Career Highlights

Throughout his career, Nishizawa has lent his expertise to esteemed companies such as Mitsui Toatsu Chemicals, Incorporated and Yamamoto Chemicals, Inc. His innovative spirit and commitment to excellence have led to the successful development of revolutionary technologies that have left an indelible mark on the industry.

Collaborations

Nishizawa has collaborated closely with notable individuals in the field, including Hisato Itoh and Yasuyuki Yamada. These partnerships have been instrumental in the success of many projects and have enhanced the overall impact of his inventions.

Conclusion

In conclusion, Tsutomu Nishizawa's exceptional talent and relentless pursuit of innovation have solidified his position as a pioneering inventor in the realm of technology. His groundbreaking patents and collaborations stand as a testament to his unwavering dedication to pushing the boundaries of what is possible in the world of inventions.

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]