Nippon Ferrofluidics Corporation

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Patent Activity in the Last 10 Years

Technologies

Intl Class Technology Matters Rank in Class
 
  
 
C09K MATERIALS FOR APPLICATIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR194
 
  
 
H01F MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES 183

Top Patents (by citation)

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Recent Publications

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Recent Patents

Patent # Title Filing Date Issue Date Intl Class
5656196 Ferrofluid having improved oxidation resistanceDec 15, 94Aug 12, 97[C09K, H01F]

Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
5394044 Magnetic bearing deviceExpiredSep 13, 93Feb 28, 95[H02K]
5372432 Dynamic pressure bearing assemblyExpiredJul 16, 93Dec 13, 94[F16C]
5092740 Composite vacuum pumpExpiredApr 27, 89Mar 03, 92[F04B]
5073737 Magnetic bearing deviceExpiredJul 27, 90Dec 17, 91[H02K]
5068558 Magnetic bearing deviceExpiredJul 27, 90Nov 26, 91[H02K]
5066879 Single power source magnetic bearing deviceExpiredApr 27, 90Nov 19, 91[H02K, F16C, G05F]
5052697 Sealing member for ferrofluid seal and method of producing the sameExpiredNov 29, 89Oct 01, 91[F16J]
5050891 Sealing member for ferrofluid sealExpiredNov 29, 89Sep 24, 91[F16J]
5046151 Magnetic bearing deviceExpiredJul 09, 90Sep 03, 91[H02K]
4955731 Bearing equipment for vacuum devicesExpiredApr 27, 89Sep 11, 90[F16C]
4847526 Variant-pole electric motorExpiredJul 09, 86Jul 11, 89[H02K]

Top Inventors for This Owner

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