TETREON TECHNOLOGIES LIMITED

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
4722659 Semiconductor wafer carrier transport apparatusExpiredMay 16, 86Feb 02, 88[B65B]
4721424 Semiconductor wafer boat loader releaseable mountingExpiredJun 30, 86Jan 26, 88[B65G]
4721427 Wafer transfer standExpiredMay 12, 87Jan 26, 88[B65G]
4711197 Gas scavengerExpiredOct 16, 86Dec 08, 87[C23C]
4692115 Semiconductor wafer furnace doorExpiredJun 30, 86Sep 08, 87[F27D]
4684863 Semiconductor wafer boat loader control systemExpiredJun 30, 86Aug 04, 87[G05B]
4658855 Mass flow controllerExpiredOct 03, 80Apr 21, 87[G05D]
4636140 Method of loading and unloading a furnaceExpiredApr 03, 85Jan 13, 87[B65G]

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