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Patent Activity in the Last 10 Years

Technologies

Intl Class Technology Matters Rank in Class
 
  
 
F04B POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS 359
 
  
 
B66C CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES 229
 
  
 
F01D NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES 263
 
  
 
F04D NON-POSITIVE-DISPLACEMENT PUMPS272
 
  
 
B01F MIXING, e.g. DISSOLVING, EMULSIFYING, DISPERSING 141
 
  
 
C02F TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE 154
 
  
 
E02B HYDRAULIC ENGINEERING 117
 
  
 
F16K VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING172
 
  
 
H02K DYNAMO-ELECTRIC MACHINES 1106

Top Patents (by citation)

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Recent Publications

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Recent Patents

Patent # Title Filing Date Issue Date Intl Class
6203282 Method to control out pumping from a sewage pump stationOct 10, 96Mar 20, 01[F04B]
6036246 Device for manipulating submerged-operating unitsNov 21, 96Mar 14, 00[B66C]
5601111 Method for automatically circulating and then halting circulation of wastewater in a wastewater pump station, and a valving device thereforeJul 17, 95Feb 11, 97[F04B]
5522631 Means for, and a method of, handling a submersible equipment which has a lifting bailDec 05, 94Jun 04, 96[B66C]
5435664 Sewage water pumping station, and a tank thereforJan 19, 94Jul 25, 95[E02B, C02F]
5352088 Pump housing deviceNov 03, 93Oct 04, 94[F01D]
5310316 Impeller for a propeller pumpAug 06, 92May 10, 94[F04D]
5281088 Centrifugal pump impeller, and in combination with a centrifugal pump housingAug 10, 92Jan 25, 94[F04D]
5250863 Motor and cooling means thereforAug 10, 92Oct 05, 93[H02K]
5221182 Vane apparatus for clog resistant pumpOct 01, 92Jun 22, 93[F01D]

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
6275219 Digitizing projection displayExpiredAug 23, 93Aug 14, 01[G09G]
5823751 Mounting device for submersible electric motor driven pumpExpiredOct 08, 96Oct 20, 98[F04B]
5789044 Zeolite molecular sieves for packaging structuresExpiredJan 24, 96Aug 04, 98[B65D]
5684346 Cooling deviceExpiredOct 29, 96Nov 04, 97[H02K]
5647666 Mixer installation deviceExpiredJan 24, 96Jul 15, 97[B01F]
5577886 Sealing device for pump impellerExpiredApr 01, 96Nov 26, 96[F04D]
5542817 Impeller for a rotary pumpExpiredMay 23, 94Aug 06, 96[F04D]
5486092 Housing for a vortex-flow type pumpExpiredOct 03, 94Jan 23, 96[F04D]
5477018 Moisture-detecting, switching device and a method of forming the sameExpiredAug 05, 93Dec 19, 95[H01H]
D342307 ValveExpiredMar 08, 91Dec 14, 93[]
D341608 Submersible mixerExpiredOct 09, 92Nov 23, 93[]
5237228 Submersible machineExpiredNov 13, 91Aug 17, 93[H02K, F16C]
5181729 Seal deviceExpiredAug 26, 91Jan 26, 93[F16J]
5145254 Mixer deviceExpiredSep 24, 91Sep 08, 92[B01F]
5141392 Connecting arrangement between impeller shaft and mixerExpiredFeb 21, 91Aug 25, 92[F01D]
4771699 Device for cable transportExpiredMar 31, 87Sep 20, 88[B61B]

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