BOC LIMITED

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
2009/0107,970 METHOD FOR CONTROLLING WELD QUALITYAbandonedSep 25, 08Apr 30, 09[B23K]
2007/0077,311 Fumigant/sterilantAbandonedOct 15, 04Apr 05, 07[A61L]
5417934 Dry exhaust gas conditioningExpiredJan 26, 93May 23, 95[B01D]
5213767 Dry exhaust gas conditioningExpiredDec 03, 90May 25, 93[B01D]
4843840 Relating to freezing apparatusExpiredNov 02, 87Jul 04, 89[F75D]
4805806 Apparatus for dispensing liquefied gasExpiredDec 04, 81Feb 21, 89[B67D]
4626646 Shielding gas for electric arc weldingExpiredNov 30, 83Dec 02, 86[B23K]
4576614 Process and apparatus for separation of a gaseous mixtureExpiredOct 26, 81Mar 18, 86[B01D]
4475350 Method of making mouldsExpiredAug 17, 81Oct 09, 84[F25D]
4471948 Cutting apparatusExpiredAug 13, 82Sep 18, 84[B23K]
4420009 Apparatus for mixing fluidsExpiredOct 13, 81Dec 13, 83[G05D, F15D]
4380457 Separation of airExpiredJun 01, 79Apr 19, 83[F25J, B01D]
4348213 Process for the separation of a gaseous mixtureExpiredMar 27, 81Sep 07, 82[B01D]
4334574 Cooling methodExpiredJun 03, 80Jun 15, 82[B22C]
4329142 Method for heat treatment of clay and refractory wareExpiredJun 10, 80May 11, 82[F27B, F27D]
4318274 Gas-operated motorsExpiredMar 30, 79Mar 09, 82[F01K]
4304286 Making mouldsExpiredMar 13, 80Dec 08, 81[B22C]
4285742 Heat treatment methodExpiredNov 29, 79Aug 25, 81[C21D]
4283212 Treatment of gas streamsExpiredApr 06, 79Aug 11, 81[F25J]
4276753 Cryogenic freezing tunnel control systemExpiredMay 19, 80Jul 07, 81[F25D]

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