DYCKERHOFF & WIDMANN AKTIENGESELLSCHAFT

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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

Top Patents (by citation)

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Recent Publications

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Recent Patents

Patent # Title Filing Date Issue Date Intl Class
5913641 Tensionable cable truss support systemDec 19, 97Jun 22, 99[E21D]
5238329 Mine roof support systemAug 11, 92Aug 24, 93[E21D]

Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
2002/0007,604 Intermediate anchorage for concrete structuresAbandonedJan 29, 01Jan 24, 02[E04B]
5745996 Sheathing cutting deviceExpiredApr 17, 96May 05, 98[B26B, H02G]
5624628 Method of introducing a casting compound into a hollow spaceExpiredSep 20, 95Apr 29, 97[B29C]
5400994 Yieldable roof support systemExpiredApr 10, 92Mar 28, 95[E21D]
5193940 Mine roof support systemExpiredAug 23, 91Mar 16, 93[E21D]
5135164 Prestressed concrete railroad tieExpiredSep 07, 90Aug 04, 92[E01B]
5056284 Bundled tensioning member for prestressing a tall structural member and method of installing sameExpiredJul 11, 89Oct 15, 91[E04C]
4970773 Method of and apparatus for locating operational surfaces on a track electromagnetically levitated vehiclesExpiredJul 27, 89Nov 20, 90[B21D]
4971493 Anchoring device for the rod-shaped tension member of an anchor, especially a rock memberExpiredOct 10, 89Nov 20, 90[E21D]
4958961 Anchoring arrangement for a rod-shaped tension member formed of fiber reinforced composite materialExpiredOct 10, 89Sep 25, 90[E04C, E02B]
4953379 Hot-rolled steel bar with helically extending ribs, method of and apparatus for producing the steel barExpiredOct 25, 88Sep 04, 90[B21H]
4922681 Hot-rolled concrete reinforcing bar, in particular reinforcing ribbed barExpiredSep 09, 88May 08, 90[E04C]
4909474 Apparatus for locating operational surfaces on a track for electromagnetically levitated vehiclesExpiredMay 19, 89Mar 20, 90[B25B, B28B, B22D]
4908129 Impervious layer formation process and landfill adsorption systemExpiredMay 23, 88Mar 13, 90[C02F, B01D]
4905359 Apparatus for forming slide surfaces on track for electromagnetically levitated vehiclesExpiredMar 14, 89Mar 06, 90[B23P]
4905896 Railroad roadway for high speed rail-mounted vehiclesExpiredOct 25, 88Mar 06, 90[E01B]
4904122 Anchoring device, such as a rock anchorExpiredAug 01, 88Feb 27, 90[E21D]
4884711 Container system for the storage of wastesExpiredMay 18, 88Dec 05, 89[B09B]
4878327 Corrosion protected tension member for use in prestressed concrete and method of installing sameExpiredMar 14, 88Nov 07, 89[E04C]
4877463 Method for producing rolled steel products, particularly threaded steel tension membersExpiredJun 07, 88Oct 31, 89[C21D]

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