Company Filing History:

10 out of 2,271

Idemitsu Kosan Company, Limited

patents

7 out of 555

Idemitsu Petrochemical Co., Ltd.

patents

Years Active: 1987-2002

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17 patents (USPTO):Sort by Forward CitationsExplore Patents

1. 6476106 - Polyarylene sulfide resin composition for electronic parts encapsulation (2002-11-05),

2. 6469091 - Polyarylene sulfide resin composition (2002-10-22),

3. 6395818 - Polyarylene sulfide resin composition for optical telecommunication members (2002-05-28),

4. 6074449 - Filter material containing a polycyanoaryl ether (2000-06-13),

5. 6042910 - Polyarylene sulfide resin composition (2000-03-28),

6. 5985974 - Slide member for parts to be in contact with magnetic tape (1999-11-16),

7. 5733962 - Polyarylene sulfide resin composition (1998-03-31),

8. 5147922 - Resin composition (1992-09-15),

9. 5089340 - Polycanoaryl ether laminate (1992-02-18),

10. 4977234 - Polycyanoaryl ether composition method for preparing the same and uses (1990-12-11),

11. 4972016 - Poly(cyanoarylether)-based resin composition (1990-11-20),

12. 4853443 - Polycyanoaryl ether with thermoplastic resin (1989-08-01),

13. 4812507 - Reinforced resinous composition comprising polycyano arylene ether (1989-03-14),

14. 4703104 - Preparation of cyanoaryl ether copolymer (1987-10-27),

15. 4663427 - Process for preparing polycyanoaryl ether powder (1987-05-05),

Title: The Innovations of Tomoyoshi Murakami

Introduction

Tomoyoshi Murakami is a prominent inventor based in Ichihara, Japan. He has made significant contributions to the field of materials science, particularly in the development of polyarylene sulfide resin compositions. With a total of 17 patents to his name, Murakami's work has had a substantial impact on the encapsulation of electronic parts.

Latest Patents

One of his latest patents is a polyarylene sulfide resin composition designed for electronic parts encapsulation. This composition includes (A) from 20 to 35% by weight of a polyarylene sulfide resin, (B) from 60 to 75% by weight of silica, and (C) from 1 to 10% by weight of an elastomer. It also contains (D) from 0.05 to 1.2 parts by weight of an epoxysilane and/or (E) from 0.1 to 3 parts by weight of an epoxy resin, both relative to 100 parts by weight of the total amount of components (A), (B), and (C). This innovative composition exhibits excellent PCT and TCT acceptable quality, good fluidity, and maintains the intrinsic properties of ordinary PAS resin. When used for sealing electronic parts, it prevents deformation of bonding wires and other elements, ensuring package integrity.

Another notable patent is a polyarylene sulfide resin composition that comprises (A) from 20 to 34% by weight of a polyarylene sulfide with a melt viscosity of 150 to 800 poises, (B) from 66 to 80% by weight of spherical silica with a mean particle size of 0.3 to 10 µm, and (C) from 0 to 12% by weight of whiskers. The total of the spherical silica and whiskers falls between 66 and 80% by weight. This composition is characterized by well-balanced physical properties, including dimensional accuracy and mechanical strength, making it suitable for precision members such as optical fiber connector ferrules.

Career Highlights

Throughout his career, Tomoyoshi Murakami has worked with notable companies, including Idemitsu Kosan Company, Limited and Idemitsu Petrochemical Co., Ltd. His experience in these organizations has contributed to his expertise

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