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For the Inventor, By the Inventor

Waki, Japan

Masayuki Sakai

This inventor holds 13 USPTO granted patents. Top assignees: Mitsui Chemicals, Inc., Mitsui Petrochemical Industries, Ltd., Nippon Paper Industries Co., Ltd.. Active years: 1987-2003.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Masayuki Sakai. Retrieved from https://idiyas.com/inventor/masayuki-sakai-ff9rouz3

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

Calculating rank
USPTO Granted Patents = 13

% Patents Active = 92.3

Average Co-Inventor Count = 4.7

ph-index = 10

Forward Citations = 408(Granted Patents)


Location History:

  • Ohtake, JP (1987)
  • Kuga, JP (1993)
  • Ichihara, JP (1996)
  • Hiroshima-ken, JP (2000)
  • Yamaguchi, JP (1996 - 2003)
  • Waki-cho, JP (2001 - 2003)

Company Filing History:

goldMedal8 out of 1,817 
 
Mitsui Chemicals, Inc.
 patents
silverMedal5 out of 1,008 
 
Mitsui Petrochemical Industries, Ltd.
 patents
bronzeMedal1 out of 343 
 
Nippon Paper Industries Co., Ltd.
 patents
where one patent can have more than one assignee

Years Active: 1987-2003

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13 patents (USPTO):Explore Patents
1. 6613259 - Process of making polyester pellets (2003-09-02),
2. 6528617 - Process for producing aliphatic polyester excellent in stability (2003-03-04),
3. 6451959 - Catalyst for polyester production, process for producing polyester using the catalyst, polyester obtained by the process, and uses of the polyester (2002-09-17),
4. 6429280 - Process for preparing polyhydroxycarboxylic acid (2002-08-06),
5. 6417266 - Process for preparing aliphatic polyester (2002-07-09),
6. 6346070 - Catalyst for polyester production, process for producing polyester using the catalyst, polyester obtained by the process, and uses of the polyester (2002-02-12),
7. 6320014 - Polyester pellets (2001-11-20),
8. 6140458 - Preparation process of polyester (2000-10-31),
9. 5573820 - Process for preparing polyester (1996-11-12),
10. 5527622 - Packaging laminate material (1996-06-18),
11. 5270444 - Process for treatment of polyethylene terephthalate, polyethylene (1993-12-14),
12. 5241046 - Process for treatment of polyethylene terephthalate, polyethylene (1993-08-31),
13. 4668752 - Linear ethylene copolymer (1987-05-26),

Title: The Innovations of Masayuki Sakai

Introduction

Masayuki Sakai is a prominent inventor based in Waki-cho, Japan. He has made significant contributions to the field of polymer science, holding a total of 13 patents. His work primarily focuses on the development of advanced polyester materials.

Latest Patents

Sakai's latest patents include a process for making polyester pellets. This innovative process involves blending polyethylene terephthalate and polyethylene isophthalate copolymer before solid-state polymerization. The polyethylene isophthalate copolymer is composed of dicarboxylic acid constituent units derived from terephthalic acid and isophthalic acid, along with diol constituent units derived from ethylene glycol and 1,3-bis(2-hydroxyethoxy)benzene. The process includes palletizing the blend and crystallizing the pellets. Another notable patent is for producing an aliphatic polyester that exhibits excellent stability. This process involves solid-phase polymerization under a flowing gas in the presence of a volatile catalyst, resulting in an aliphatic polyester with a desired weight average molecular weight ranging from 50,000 to 1,000,000. The polyester undergoes heat treatment to enhance its stability during molding and storage.

Career Highlights

Throughout his career, Masayuki Sakai has worked with notable companies such as Mitsui Chemicals, Inc. and Mitsui Petrochemical Industries, Ltd. His expertise in polymer technology has been instrumental in advancing the capabilities of these organizations.

Collaborations

Sakai has collaborated with esteemed colleagues, including Shoji Hiraoka and Koji Nakamachi. Their combined efforts have contributed to the development of innovative solutions in the field of polymer science.

Conclusion

Masayuki Sakai's contributions to polymer technology through his patents and collaborations highlight his significant role as an inventor. His work continues to influence the industry and pave the way for future innovations in polyester materials.

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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