Last November Ohi Works (transliteration of 大井製作所) applied for a patent for self-developed insulation bolt. On May 1st 2015 the company received the patent certificate from the Patent Office. The patent is titled “insulation bolt and its fastening structure”. Patent number 5740039. Content includes “OHi electrical insulation bolt structure” and the exclusive lining technology that can firmly bond metal and
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http://www.fastener-world.com.tw/new/news_detail.php?id=4231
Last November Ohi Works (transliteration of 大井製作所) applied for a patent for self-developed insulation bolt. On May 1st 2015 the company received the patent certificate from the Patent Office. The patent is titled “insulation bolt and its fastening structure”. Patent number 5740039. Content includes “OHi electrical insulation bolt structure” and the exclusive lining technology that can firmly bond metal and resin.