JOY MINING MACHINERY LIMITED

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Patent Activity in the Last 10 Years

Technologies

Intl Class Technology Matters Rank in Class
 
  
 
E21D SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS 214
 
  
 
B01D SEPARATION 1133
 
  
 
E02D FOUNDATIONS; EXCAVATIONS; EMBANKMENTS 122
 
  
 
F16L PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL169

Top Patents (by citation)

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Recent Publications

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Recent Patents

Patent # Title Filing Date Issue Date Intl Class
5558761 Fluid filtering unit with movable collector for cleaningJan 25, 95Sep 24, 96[B01D]
5454669 Yield valveJan 06, 94Oct 03, 95[E21D]
5423638 Mine roof supportsMar 09, 94Jun 13, 95[E02D]
5135264 Flow coupling with frangible pressure sensitive holding member to allow ventingJun 14, 91Aug 04, 92[F16L]
5073067 Mine roof supportApr 04, 91Dec 17, 91[E21D]

Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
5735552 Swivel couplerExpiredOct 03, 95Apr 07, 98[F16L]
5039257 Mine roof supportsExpiredMay 11, 90Aug 13, 91[E21D]
4993779 Element to form a rack for a mining machine haulage systemExpiredMar 29, 90Feb 19, 91[F16G, F21C]
4940363 Mine roof support assemblyExpiredNov 17, 89Jul 10, 90[E21D]
4934758 Appartaus for mounting ancillary equipmentExpiredSep 12, 88Jun 19, 90[F21D]
4908284 Solid state batteriesExpiredJun 14, 88Mar 13, 90[H01M]
4859335 Fluid filtering systemsExpiredFeb 09, 88Aug 22, 89[B01D]
4692067 Control systemsExpiredJun 18, 84Sep 08, 87[E21D]
4636306 Fluid filtering systemsExpiredJul 23, 85Jan 13, 87[B01D]
4609308 Roof support suitable for use in minesExpiredJul 02, 84Sep 02, 86[E21D]
4607986 Shield supports suitable for use in minesExpiredJul 19, 84Aug 26, 86[E21D]
4552488 Mine roof support systemExpiredJan 12, 83Nov 12, 85[E21D]
4548527 Roof support suitable for use in minesExpiredJun 21, 84Oct 22, 85[E21D]
4512686 Roof support suitable for use in minesExpiredMar 27, 84Apr 23, 85[E21D]
4505517 Self-advancing mine roof supportsExpiredOct 22, 82Mar 19, 85[E21D]
4492495 Roof support for use in minesExpiredJun 13, 83Jan 08, 85[E21D]
4491441 Self-advancing support and control means thereforExpiredOct 13, 83Jan 01, 85[]
4473324 Mine roof supportsExpiredFeb 23, 83Sep 25, 84[E21D]
4432673 Mine roof supportExpiredApr 20, 82Feb 21, 84[E21D]
4430026 Roof support suitable for use in minesExpiredNov 17, 81Feb 07, 84[E21D]

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