Company Filing History:
3 out of 240 
3 out of 57 Years Active: 1997-1999
Title: Shigeru Kawahara: Innovator in Magnetic Head Substrate Materials
Introduction
Shigeru Kawahara is a notable inventor based in Kusatsu, Japan. He has made significant contributions to the field of materials science, particularly in the development of substrate materials for magnetic heads. With a total of 3 patents, his work has been instrumental in advancing high-density recording technologies.
Latest Patents
Kawahara's latest patents focus on innovative substrate materials designed for magnetic heads. One of his key inventions is a substrate material that provides characteristics suitable for achieving high recording density. This material comprises a matrix phase of a carbide of one or more of titanium (Ti), tungsten (W), and tantalum (Ta), along with a dispersion phase of an oxide of aluminum (Al₂O₃), chromium (CrO₃), and zirconium (ZrO₂). The composition includes 60 to 95 vol % of the carbide matrix phase, with a preference for a single phase where the carbide ingredients are represented as (TiₑWₘTaₙ)Cₓ. Additionally, oxygen and/or nitrogen may be solid-solubilized in the carbide matrix phase.
Another significant patent involves substrate materials for magnetic heads with low flying height. These materials consist of 24-75 mol % of α-Al₂O₃ and the remaining 76-25 mol % of TiCₓOᵧN𝓏, or TiCₓOᵧN𝓏 containing small amounts of additives. They are designed to retain essential characteristics while ensuring controlled sizes of crystallites and relieving internal stress, thus facilitating the fabrication of high-precision thin-film heads for high-density recording.
Career Highlights
Throughout his career, Shigeru Kawahara has worked with prominent companies such as Sumitomo Special Metals Co., Ltd. and Nippon Tungsten Co., Ltd. His expertise in materials science has allowed him to contribute to various projects that enhance the performance of magnetic recording technologies.
Collaborations
Kawahara has collaborated with notable colleagues in his field, including Shin Mishima and Shigeki Mohri. These partnerships have fostered innovation and have been crucial in the development of advanced materials for magnetic heads.
Conclusion
Shigeru Kawahara's contributions to the field of magnetic head substrate materials
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