Ferrofluidics Corporation

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Patent Activity in the Last 10 Years

Technologies

Intl Class Technology Matters Rank in Class
 
  
 
F16J PISTONS; CYLINDERS; PRESSURE VESSELS IN GENERAL; SEALINGS149

Top Patents (by citation)

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Recent Publications

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Recent Patents

Patent # Title Filing Date Issue Date Intl Class
5474302 On-site fillable ferrofluidic sealAug 27, 92Dec 12, 95[F16J]

Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
6290894 Ferrofluid sculpting apparatusExpiredMar 24, 99Sep 18, 01[H05B]
6242994 Apparatus to reduce push back time in solenoid valvesExpiredMar 16, 99Jun 05, 01[H01F]
5969589 Quiet ferrofluid solenoidExpiredAug 28, 96Oct 19, 99[H01F]
5955934 Quiet ferrofluid solenoid with cushionExpiredMar 26, 98Sep 21, 99[H01F]
5806856 On-site fillable liquid magnetic sealExpiredNov 21, 96Sep 15, 98[F16J]
5780741 Sensor employing a sliding magnet suspended on ferrofluidExpiredFeb 11, 97Jul 14, 98[G01P]
5636547 Liquid level monitoring system having ferrofluid pressure sensorExpiredNov 29, 94Jun 10, 97[G01L]
5594241 Apparatus and method for jitter attenuation in rotary encodersExpiredFeb 07, 95Jan 14, 97[G01D]
5490425 Ferrofluid pressure sensor and warning deviceExpiredMar 14, 94Feb 13, 96[G01L]
5462685 Ferrofluid-cooled electromagnetic device and improved cooling methodExpiredDec 14, 93Oct 31, 95[H01F, H05K]
5461677 LoudspeakerExpiredAug 03, 94Oct 24, 95[H04R]
5429000 Ferrofluid pressure sensorExpiredDec 21, 93Jul 04, 95[G01L]
5340122 Differentially-pumped ferrofluidic sealExpiredJun 22, 92Aug 23, 94[F16J]
5018751 Stacked pole-piece ferrofluid seal apparatusExpiredJun 28, 89May 28, 91[F16J]
4927164 Ferrofluid seal with epoxy pole piecesExpiredAug 08, 88May 22, 90[F16J]
4898480 Compact ferrofluidic electrically conducting sealed bearingExpiredOct 27, 88Feb 06, 90[F16C]
4890850 Tapered ferrofluid sealExpiredApr 18, 88Jan 02, 90[F16J]
4865334 Long-life multi-stage ferrofluid seals incorporating a ferrofluid reservoirExpiredNov 04, 88Sep 12, 89[F16J]
4830384 Compact long-life magnetic fluid sealExpiredJun 29, 87May 16, 89[F16J]
4824122 Compact magnetic fluid low pressure sealExpiredJul 06, 88Apr 25, 89[F16J]

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