| Patents for E04F 17 - Vertical ducts; Channels, e.g. for drainage (3,992) |
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| 12/13/1990 | DE4017663A1 Protection of prefab chimney from damage during transport - by holding chimney sections together with tension bolt |
| 11/28/1990 | CN2066465U Imitation of ancient domestic chimney made of concrete |
| 11/20/1990 | US4970837 Chimney covering |
| 11/07/1990 | CN1046772A Method for making acid-proof concrete flue for domestic briquet stove |
| 11/07/1990 | CN1046771A 复合烟囱 Composite chimney |
| 11/06/1990 | CA1275822C Pre-fabricated and modular chimney facade system |
| 10/30/1990 | US4965972 Combined deck unit and cellular raceway |
| 10/25/1990 | DE3913325A1 Municipal services conduit seal - comprises protruding rubber frame fitting in peripheral recess in cover |
| 10/16/1990 | US4962621 Modular brick chimney unit |
| 10/10/1990 | CN2063552U Sealed refuse channel hole means |
| 10/10/1990 | CN2063551U Plate type flue gas exhaust |
| 09/26/1990 | CN1045622A Drainage pipe made of light-glazed material |
| 09/20/1990 | WO1990010966A1 Trunking for use in a raised floor and a raised floor incorporating said trunking. |
| 09/04/1990 | US4953334 Economy building panel |
| 08/29/1990 | CN2061166U High stories drop type safety conveyer |
| 08/16/1990 | DE4003818A1 Chimney passing system through concrete roof - drills holes to pattern to pattern of those in guide member |
| 08/01/1990 | CN2059929U Discharge flue capable of preventing crossed flow |
| 06/27/1990 | EP0374570A1 Device for prefabricated lift shaft modules |
| 06/27/1990 | EP0374468A1 Improvements in or relating to lift shafts |
| 06/14/1990 | WO1990006469A1 Multiple walled chimney |
| 06/13/1990 | EP0372396A1 Door/ledge assembly for gravity chute |
| 06/12/1990 | US4932181 Base assembly for an open office partition panel |
| 05/31/1990 | DE3839950A1 Hot gas channel |
| 05/30/1990 | EP0370983A2 A base assembly for an open office partition panel |
| 05/29/1990 | US4929000 Multiple walled chimney |
| 05/23/1990 | DE3900031C1 Weather protection grating for a rear-ventilation gap |
| 05/23/1990 | CA2003521A1 Base assembly for an open office partition panel |
| 05/10/1990 | DE3935589A1 Mechanism enlarging chimney bore by rotary tool - inserts angular drive through inspection aperture in chimney base, with tool moved from top to base |
| 05/03/1990 | DE3837166A1 Building heating system |
| 05/03/1990 | DE3837145A1 Securing device for shaft coverings, in particular for cellar gratings |
| 04/26/1990 | DE3836153A1 Protective insert for light shafts and/or ventilation shafts |
| 04/25/1990 | EP0364497A1 Through construction element |
| 04/24/1990 | US4918886 Raceway system for modular wall panels |
| 04/04/1990 | CN2055513U Chimney |
| 03/29/1990 | DE3928622A1 Preassembled building services module - has one leg of U=shaped wall element flush with bath tub edge and slot for sliding accommodation of shower screen |
| 03/29/1990 | DE3831995A1 Device for closing openings, e.g. ventilation shafts |
| 03/29/1990 | DE3831318A1 Device for deflecting and channelling light radiation into windowless rooms in combination with a device for ventilating the rooms |
| 03/22/1990 | DE3924054A1 Plastic frame for cellar windows - has rim of grill held by overlapping parallel wedges fitting into slots on frame and removed while grill is taken out if not needed |
| 03/21/1990 | CN2054817U Safety flue pipe |
| 03/14/1990 | EP0357737A1 Improvements in or relating to lift shafts. |
| 03/06/1990 | US4905433 Hospital head wall system |
| 02/28/1990 | EP0355695A2 Cylindrical honey comb cartridge for electromagnetically shielded ventilation, air extraction, lighting or resounding |
| 02/27/1990 | US4903455 Panel for a window well cover and the like |
| 02/21/1990 | CN1006923B Microsound exhaust method of diesel (gasoline) generator units |
| 02/01/1990 | DE3824178A1 Sound-insulating load-bearing device |
| 01/31/1990 | CN2052017U Remote controller of ventilation system |
| 01/30/1990 | US4896469 Prefabricated building panel assembly |
| 01/30/1990 | US4896467 Window well cover |
| 01/17/1990 | CN2051258U Pluging-type residence flue |
| 01/11/1990 | DE3921200A1 Vorrichtung zur aufnahme und verarbeitung von muell Apparatus for recording and processing of trash |
| 01/10/1990 | EP0349802A1 Chimney cowl for ventilated multi-layered domestic chimneys |
| 12/26/1989 | US4888923 Cupola Mount |
| 12/21/1989 | DE3820507A1 Bearing means for a shaft covering |
| 12/19/1989 | US4887401 Knock down partition wall assembly |
| 12/07/1989 | DE3837056A1 Process and apparatus of the installation duct system |
| 12/06/1989 | EP0344151A1 Means for repairing pipes by remote-controlled insertion of a lining |
| 12/06/1989 | CN2048881U Prestressed rainforced concrete downpipe |
| 11/30/1989 | DE3913557A1 Construction kit for a flue gas duct |
| 11/23/1989 | DE3816284A1 Sound-insulating load-bearing device |
| 11/15/1989 | EP0341523A1 Chimney pipe element |
| 11/09/1989 | DE3907987A1 Air grating |
| 11/07/1989 | US4878326 Locking and seating means for chimney liners |
| 11/02/1989 | DE3832227C1 Line lead-through for lines which are to be led in a sealed manner through a housing wall |
| 10/31/1989 | US4877106 Sound-attenuating discharge apparatus for a packaged terminal air conditioner |
| 10/31/1989 | US4876833 Accessible areaway system |
| 10/26/1989 | DE3832228C1 Line lead-through for lines which are to be led in a sealed manner through a housing wall |
| 10/03/1989 | US4870792 Passage of pressurized fluids through masonry work |
| 09/27/1989 | CN2045005U Bamboo chimney shaft |
| 09/21/1989 | WO1989008753A1 Improvements in or relating to lift shafts |
| 09/14/1989 | DE3807136A1 Process for repairing chimneys, and apparatus for carrying out the individual process steps |
| 09/05/1989 | US4862659 Wall panel with accessible interior channels for laying in of cables |
| 08/22/1989 | US4858680 Door saddle for baseboard heating |
| 08/10/1989 | WO1989007181A1 Fire-resisting cladding |
| 07/27/1989 | DE3801732A1 Sound-insulating sheeting and wound sheeting for pipes and ducts |
| 06/08/1989 | DE3740470A1 Drainage gutter and gutter system constructed therewith |
| 06/06/1989 | US4835915 Indirect office lighting system |
| 05/18/1989 | DE3737416A1 Process for producing a flexible insulating panel from mineral fibres and flexible insulating panel |
| 05/17/1989 | CN2037763U Pedal device for opening the cover of garbage can |
| 05/11/1989 | DE3736723A1 Multi-shelled chimney |
| 04/27/1989 | DE3833647A1 Fastening device for chimney claddings |
| 04/18/1989 | US4821473 To reduce chimney fires and handle smoke |
| 04/12/1989 | EP0311159A1 System for discharging waste gasses and/or supplying air |
| 04/11/1989 | US4819403 Method for installing elevator doors |
| 04/06/1989 | WO1989003003A1 Process and means for repairing pipes by remote-controlled insertion of a lining |
| 04/06/1989 | DE3732152A1 Cladding for rectangular chimneys |
| 04/05/1989 | EP0309820A2 Air channel stiffening |
| 03/28/1989 | US4815243 Concrete masonry block and stud wall construction systems |
| 03/14/1989 | US4812958 Electrical services pole |
| 03/14/1989 | US4811534 Chimney facade system |
| 03/09/1989 | WO1989002015A1 Through construction element |
| 03/09/1989 | WO1989002014A1 Improved coupling for concrete wall of floor mounting |
| 03/02/1989 | DE3727713A1 Prefabricated light-shaft unit |
| 02/23/1989 | WO1989001450A1 Isolated insertion chute for suction-operated garbage disposal systems |
| 02/22/1989 | EP0304407A2 Isolated insertion chute for suction-operated garbage disposal systems |
| 02/22/1989 | CN2033033U Curtain board gate for rubbish |
| 02/09/1989 | DE3725147A1 Sound-insulating component |
| 02/08/1989 | EP0302113A1 Method and apparatus for collecting waste material |
| 01/31/1989 | US4800696 Premise wiring system for frame structures |
| 01/31/1989 | US4800695 Electrical raceway floor track |
| 01/18/1989 | EP0299135A2 Chimney equipped with a ventilating system |