Ruhrgas Aktiengesellschaft

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Patent Activity in the Last 10 Years

Technologies

Intl Class Technology Matters Rank in Class
 
  
 
C01B NON-METALLIC ELEMENTS; COMPOUNDS THEREOF178

Top Patents (by citation)

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Recent Publications

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Recent Patents

Patent # Title Filing Date Issue Date Intl Class
7108803 Gas odorization methodAug 04, 99Sep 19, 06[C01B]

Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
2003/0108,559 Modulation of cholesteryl ester transfer protein (CETP) activityAbandonedJan 08, 03Jun 12, 03[A61K, C07H, C12P, C12N, C07K]
6490908 Method and device for determining the gas properties of a combustible gasExpiredSep 28, 01Dec 10, 02[G01J, G01N]
6446487 Method for measuring the quantity of heat present in fuel gasExpiredJun 02, 00Sep 10, 02[G01N]
6425942 Method and device for drying a gasExpiredJun 13, 00Jul 30, 02[B01D]
6279380 Noncombustive method of determining the calorific value of fuel gasExpiredMay 20, 99Aug 28, 01[G01N, G01F]
6244097 Method for measuring without combustion the heat value of fuel gasExpiredApr 27, 00Jun 12, 01[G01N, G01R]
5913326 Automatic closing device for a shut-off deviceExpiredFeb 02, 96Jun 22, 99[F16K]
5333591 Device to control a gas-fired applianceExpiredMar 10, 93Aug 02, 94[F02M]
5188527 Method of and system for cleaning the surface of furnace rollers of a roller hearth furnaceExpiredJul 19, 90Feb 23, 93[F27D]
5055032 A burner with a flame retention deviceExpiredOct 12, 89Oct 08, 91[F23R]
4960378 Gas burnerExpiredSep 23, 88Oct 02, 90[F23D]
4941345 Method and apparatus for the measurement of gas propertiesExpiredMar 14, 88Jul 17, 90[G01N]
4859171 Method and apparatus of operating pre-mixed burnersExpiredAug 31, 87Aug 22, 89[F23N]
4802142 Device for controlling the flow rate of a fuel gas/air mixture and/or the ratio between fuel gas and air in a fuel gas/air mixtureExpiredMar 31, 87Jan 31, 89[G05D, B01F]
4749002 Shut-off device in the form of a ball valveExpiredMar 23, 87Jun 07, 88[F16K]
4738577 Furnace for the heat treatment of work piecesExpiredMay 21, 86Apr 19, 88[B65G, B66C]
4723873 Method and device for preparing an existing buried conduit for replacement by a new conduitExpiredJul 23, 86Feb 09, 88[F16L, F25D, B26F]
4699122 Storage water heater systemExpiredOct 31, 85Oct 13, 87[F24H]
4689009 Skid system for carrying a furnace chargeExpiredNov 21, 85Aug 25, 87[F27D]
4659306 Method of and system for determining the ratio between the oxygen-carrying gas content and the fuel content of a mixtureExpiredMar 08, 85Apr 21, 87[F23N]

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