TSINGHUA UNIVERSITY, A CORPORATION OF CHINA

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
6402444 Type of parallel machine tool frame driven by slider and extensible strutExpiredMar 03, 00Jun 11, 02[B23Q, B23C]
5091913 Quartz crystal tuning he-ne double frequency laserExpiredApr 10, 90Feb 25, 92[H01S]
5055117 Air filtering apparatusExpiredMay 15, 90Oct 08, 91[B03C]

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