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For the Inventor, By the Inventor

Mobara, Japan

Masaharu Koyama

This inventor holds 10 USPTO granted patents. Top assignee: Hitachi, Ltd.. Active years: 1977-1985.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Masaharu Koyama. Retrieved from https://idiyas.com/inventor/masaharu-koyama

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

USPTO Granted Patents = 10

% Patents Active = 100.0

Average Co-Inventor Count = 3.8

ph-index = 9

Forward Citations = 165(Granted Patents)


Location History:

  • Mobara, JA (1977 - 1978)
  • Mobara, JP (1978 - 1985)

Company Filing History:

goldMedal10 out of 42,731 
 
Hitachi, Ltd.
 patents

Years Active: 1977-1985

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10 patents (USPTO):Explore Patents
1. 4494825 - Fill port seal with first and second photosensitizers (1985-01-22),
2. 4458987 - Multi-layer liquid crystal panel with sealing members and retainers in (1984-07-10),
3. 4431683 - Process for producing transparent electroconductive film (1984-02-14),
4. 4412214 - Liquid crystal display element having non-display electrode arrangement (1983-10-25),
5. 4341445 - Liquid crystal display element and production thereof (1982-07-27),
6. 4269617 - Process for the manufacture of liquid crystal display element (1981-05-26),
7. 4127321 - Liquid crystal display apparatus (1978-11-28),
8. 4070749 - Method of manufacturing liquid crystal display devices (1978-01-31),
9. 4043639 - Field effect type liquid crystal display elements provided with (1977-08-23),
10. 4037930 - Liquid crystal display cells (1977-07-26),

Title: Innovations of Masaharu Koyama

Introduction

Masaharu Koyama is a prominent inventor based in Mobara, Japan. He has made significant contributions to the field of liquid crystal display technology, holding a total of 10 patents. His work is characterized by innovative solutions that enhance the reliability and efficiency of display devices.

Latest Patents

One of Koyama's latest patents is a fill port seal with first and second photosensitizers. This invention involves a liquid crystal display device where a fill port for inserting a liquid crystal composition is sealed using a photo-setting resin composition. This composition comprises an acrylic or methacrylic type resin as a major component and two or more photosensitizers that differ in quality. This innovation ensures excellent reliability, allowing the sealed portion of the fill port to be sufficiently and uniformly cured in both surface and inner portions through light irradiation in a short time.

Another notable patent is for a multi-layer liquid crystal panel with sealing members and retainers. This invention pertains to a liquid crystal display device that features stacked light-transmitting substrates of varying sizes. A retainer is strategically placed directly beneath a sealing member that seals the first and second substrates, as well as between the second and third substrates. The retainer is applied simultaneously with the sealing member, ensuring that the gaps between the substrates remain uniform across the display area.

Career Highlights

Masaharu Koyama is associated with Hitachi, Ltd., a leading company in technology and innovation. His work at Hitachi has allowed him to develop groundbreaking technologies that have advanced the field of liquid crystal displays.

Collaborations

Koyama has collaborated with notable colleagues, including Hironari Tanaka and Tadashi Ishibashi. These collaborations have contributed to the successful development of his innovative patents.

Conclusion

Masaharu Koyama's contributions to liquid crystal display technology through his patents reflect his expertise and commitment to innovation. His work continues to influence the industry and enhance the performance of display devices.

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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