Ruhrkohle AG

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Patent Activity in the Last 10 Years

Technologies

Intl Class Technology Matters Rank in Class
 
  
 
E21B EARTH OR ROCK DRILLING 195

Top Patents (by citation)

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Recent Publications

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Recent Patents

Patent # Title Filing Date Issue Date Intl Class
5560437 Telemetry method for cable-drilled boreholes and method for carrying it outJul 25, 94Oct 01, 96[F21B, E21B]

Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
5810134 Underground energy-supply trainExpiredMar 03, 97Sep 22, 98[E21F]
5740920 Jigging screen device with pneumatic valve controlExpiredJul 28, 95Apr 21, 98[B03B]
5598149 Commercial-size, automatic industrial plant having several partsExpiredMar 28, 94Jan 28, 97[H04Q]
5421963 Coke-feeding device with housing for a dry cooling installation for cokeExpiredJul 08, 93Jun 06, 95[C10B]
5279713 DoorExpiredMar 06, 92Jan 18, 94[C10B]
5176470 Water-tight bore shaft foundationExpiredJun 13, 91Jan 05, 93[E21D]
5155966 Roof structureExpiredApr 04, 90Oct 20, 92[E04G]
5150543 DoorExpiredNov 06, 90Sep 29, 92[E06B]
5107180 System for operating a portable lampExpiredNov 01, 90Apr 21, 92[H05B]
5100536 Method of processing substancesExpiredApr 30, 90Mar 31, 92[C10G]
5076019 DoorWithdrawnNov 06, 90Dec 31, 91[E06B]
5045179 Process for the hydrogenation reprocessing of used oilsExpiredJul 15, 88Sep 03, 91[C10M]
5039379 Dry cooling of cokeExpiredNov 25, 88Aug 13, 91[C10B]
5015457 Process for the hydrogenation of organochlorine compounds, neutralization of the hydrochloric acid obtained and a neutralization agent for hydrochloric acid obtained from organochlorine compoundsExpiredAug 15, 89May 14, 91[C01B]
4992657 Apparatus for detecting the cutting horizon for mining machinesExpiredDec 14, 88Feb 12, 91[G01J]
4986032 DoorExpiredApr 10, 90Jan 22, 91[E06B]
4952284 Locking device for an oven doorExpiredJul 28, 88Aug 28, 90[C10B]
4929179 Roof structureExpiredOct 17, 88May 29, 90[F27D]
4927501 Oven doorExpiredJul 28, 88May 22, 90[C10B]
4778219 Jigging machineExpiredJul 26, 85Oct 18, 88[B03B]

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