James Howden & Company Limited

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Patent Activity in the Last 10 Years

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
5217235 Seal assemblyExpiredApr 22, 92Jun 08, 93[F16J]
4874267 Tunnel boring machineExpiredDec 15, 87Oct 17, 89[E21D]
4826214 Pipeline safety jointExpiredAug 06, 87May 02, 89[F16L]
4776962 Filtering apparatus and methodExpiredAug 03, 87Oct 11, 88[B01D]
4748339 Wind turbine operated electrical generator systemExpiredApr 27, 87May 31, 88[F03D]
4725198 Gas circulatorExpiredJun 24, 86Feb 16, 88[F04D]
4710101 Wind turbineExpiredApr 25, 86Dec 01, 87[F03D]
4688827 Pipeline safety jointExpiredJun 18, 86Aug 25, 87[F16L]
4689076 Method of operating metallurgical furnace and a metallurgical furnace apparatusExpiredMay 10, 85Aug 25, 87[F27D, C21B]
4648801 Wind turbinesExpiredMay 21, 86Mar 10, 87[F03D]
4630999 Axial fanExpiredOct 11, 84Dec 23, 86[F04D]
4621582 Coal burnerExpiredMar 12, 85Nov 11, 86[F23D]
4579288 PulverizerExpiredFeb 21, 84Apr 01, 86[B02C]
4575309 Wind turbinesExpiredMay 22, 84Mar 11, 86[F03D]
4560331 Lubricant reservoirExpiredNov 06, 84Dec 24, 85[F04B]
4553704 Pulverizing apparatusExpiredFeb 21, 84Nov 19, 85[B02C]
4541737 Scoop for picking up lubricantExpiredNov 01, 84Sep 17, 85[F16N, F16C]
4535551 Transfer apparatusExpiredMar 14, 84Aug 20, 85[F26B]
4448552 Bearing lubrication systemExpiredAug 18, 82May 15, 84[F16N, F16C]
4255080 Fans or the likeExpiredMar 23, 79Mar 10, 81[F04D]

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