Shibaura Denki Kabushiki Kaisha

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
4604731 Output circuit for a semiconductor memory deviceExpiredSep 02, 83Aug 05, 86[H03K, G11C]
4511980 Electron beam exposure apparatusExpiredJun 16, 82Apr 16, 85[H01J]
4497513 Locking device for door of cooking apparatusExpiredSep 15, 82Feb 05, 85[E05C]
4490412 Method of making a solar energy collector elementExpiredJun 02, 82Dec 25, 84[C23C, B05D, B05B]
4368180 Method for producing powder of .alpha.-silicon nitrideExpiredAug 17, 81Jan 11, 83[C01B]
4268868 Beam scanning type electronic copying apparatusExpiredJan 30, 80May 19, 81[H04N]

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