| Patents for E04G 21 - Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work (22,137) |
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| 12/25/1991 | CN2091325U Two-self lock safety device for bridge type scaffold |
| 12/17/1991 | US5073077 Multi-directional lifting and handling attachment for a boom-type vehicle |
| 12/14/1991 | CA2031040A1 Slidable safety net assembly |
| 12/13/1991 | WO1991019878A1 Method to protect glass in doors and windows |
| 12/12/1991 | WO1991019065A1 Handling device |
| 12/12/1991 | DE4018042A1 Muff for joining two abutting reinforcement bars - is compressed by redn. ring, and has upper part with counter bearing for its support |
| 12/05/1991 | DE4017311A1 Erection of roof scaffolding - involves fixture for attachment to roof joist and connected rod-form scaffolding component retainer |
| 11/27/1991 | EP0457806A1 Building construction system |
| 11/26/1991 | US5067586 Safety guard apparatus |
| 11/26/1991 | US5067299 Method of stacking and installing unitized roofing schemes |
| 11/21/1991 | EP0457315A1 Reinforcement connector and concrete-construction with such a connector |
| 11/21/1991 | DE4109706A1 Steel component cast into concrete |
| 11/20/1991 | CN2089038U Numeric control prestressing wire drawing machine |
| 11/19/1991 | US5066203 Apparatus for pneumatically discharging concrete |
| 11/19/1991 | US5066167 Prestressed concrete lining in a pressure tunnel |
| 11/13/1991 | EP0456020A1 Arrangement for realising brickwork mechanically |
| 11/06/1991 | EP0455495A1 Method and apparatus for transferring concrete slabs |
| 11/06/1991 | CN2088139U Automatic mixing feeding and filling device |
| 11/05/1991 | CA2041710A1 Method and equipment for transferring concrete slabs |
| 11/05/1991 | CA1291735C Safety net arrangement for multi-floor buildings under construction, and method |
| 11/05/1991 | CA1291630C Molding for the retention of a tie in the concreting of a precast concrete part |
| 10/31/1991 | WO1991016514A1 Attachment for armuoring |
| 10/30/1991 | CN2087654U Multifunctional concrete spouting machine |
| 10/29/1991 | CA1291470C Safety support structure |
| 10/29/1991 | CA1291356C Safety fence assembly for use in a building under construction |
| 10/22/1991 | US5059067 Method for forming a curved interior profile to a cementitious material |
| 10/22/1991 | US5058469 Cable shear and clamp system |
| 10/22/1991 | US5058348 Method and apparatus for forming a path for a screeding means |
| 10/16/1991 | EP0451655A1 Device for the rationalized bricklaying |
| 10/15/1991 | US5056753 Safety support structure |
| 10/15/1991 | US5056284 Bundled tensioning member for prestressing a tall structural member and method of installing same |
| 10/09/1991 | CN1055216A Construction of buildings |
| 10/08/1991 | US5054985 Method for mounting wall constituent members and a guide jig to be used in the same method |
| 10/08/1991 | US5054755 Joist hanger mounting tool |
| 10/08/1991 | US5054614 Twistable wire clamp for connecting or closing objects |
| 10/08/1991 | US5054580 Modular walkway system |
| 10/08/1991 | US5054576 Roof lifeline safety system and anchor assembly therefor |
| 10/03/1991 | WO1991014841A1 Installation of safes |
| 10/03/1991 | WO1991014839A1 Construction site safety |
| 10/03/1991 | CA2078779A1 Construction site safety |
| 10/02/1991 | CN2085826U Square rod vibrator for compacting concrete |
| 10/01/1991 | CA1289922C Building safety net |
| 09/28/1991 | WO1991014842A1 A fastening member for fastening a protecting or shielding cover to a scaffolding or a similar supporting structure, and a tool for use in mounting the fastening member |
| 09/28/1991 | CA2078127A1 Fastening member for fastening a protecting or shielding cover to a scaffolding or a similar supporting structure, and a tool for use in mounting the fastening member |
| 09/28/1991 | CA2039202A1 Roof safety anchor |
| 09/18/1991 | CN2084961U Device for reducing noise of plug-in vibrator |
| 09/18/1991 | CN2084960U Vacuum water-absorption soft sucking mat |
| 09/12/1991 | DE4007740A1 Decontamination facility for personnel - has modular assembly of cabins with programmed operation of doors for cleaning cycle |
| 09/11/1991 | EP0445187A1 Process for the construction of walls of buildings and/or work performed thereon |
| 09/11/1991 | EP0412078A4 Brick laying tools |
| 09/03/1991 | US5044136 Concrete reinforcement device |
| 08/29/1991 | DE4005852A1 Concrete reinforcement connector - has loop between plug and body and round outside to extract body |
| 08/27/1991 | US5043124 Method for treatment of support rods |
| 08/27/1991 | US5042337 Cable shear |
| 08/27/1991 | US5042222 Method and apparatus for the transfer of building materials |
| 08/27/1991 | US5042219 Flat steel anchor for precast concrete pieces |
| 08/21/1991 | EP0442124A1 Method and arrangement for the application of a measuring coil to a prestressed tendon in a concrete construction |
| 08/21/1991 | EP0231263B1 Concrete finishing machine having counterbalanced blade pitch adjustment apparatus |
| 08/20/1991 | CA1287857C Method and apparatus for suspending cladding from scaffolding |
| 08/20/1991 | CA1287792C Lashing machine |
| 08/14/1991 | EP0441029A1 Process for making tendons for prestressed concrete structures |
| 08/14/1991 | CN2082739U Mortar paving device for laying miniature hollow blocks |
| 08/13/1991 | US5038889 Scaffold enclosure |
| 08/13/1991 | US5038545 Reinforcing steel rod with improved reverse bendability |
| 08/13/1991 | US5038492 Apparatus and method for marking locations of studs in walls |
| 08/08/1991 | WO1991011575A1 Temporary roofing for building sites composed of elements which slide under and over each other |
| 08/08/1991 | DE4102525A1 Method of constructing outer wall of chimney - uses template to place mortar in required positions |
| 08/08/1991 | DE4003398A1 Support for concrete reinforcing bars - is ladder shaped and made from channel sections |
| 08/07/1991 | CN2082289U Multi-function double reel stretch-drawing machine |
| 08/06/1991 | US5036949 Motion-stopping safety system for workers |
| 07/31/1991 | EP0439060A2 Device and its application in the erection of dry partition |
| 07/30/1991 | US5035352 Adjustable apparatus for spreading mortar and method therefor |
| 07/30/1991 | CA1287025C Perimeter safety net system for multi-story buildings under construction |
| 07/27/1991 | WO1991011574A1 Device for leveling concreted surface |
| 07/27/1991 | CA2049349A1 Concrete leveling apparatus |
| 07/24/1991 | EP0438383A1 Prestressed lining concrete in a pressure gallery |
| 07/24/1991 | EP0438365A1 Method facilitating the making of joints in brickwalls |
| 07/23/1991 | CA1286518C Hoist coupling |
| 07/16/1991 | US5031886 Portable framing aid |
| 07/10/1991 | CN1052915A Multiple-top vibrator for sand lining pile |
| 07/09/1991 | US5029670 Frame erection safety system and components thereof |
| 07/09/1991 | US5029421 Modular gantry and structural element therefor |
| 07/05/1991 | CA2025679A1 Debris net/scaffolding frame lifting system |
| 07/03/1991 | EP0408645A4 Clamp for building structures |
| 07/03/1991 | CN2080082U Rotor tide type concrete jet machine |
| 06/27/1991 | WO1991009191A1 Structure support means |
| 06/19/1991 | EP0432854A1 Device for remote pouring of concrete |
| 06/19/1991 | EP0424417A4 A stanchion assembly |
| 06/11/1991 | US5023788 Control apparatus of working robot to flatten and finish the concreted floor |
| 06/11/1991 | US5022199 Construction apparatus and construction method |
| 06/11/1991 | US5022125 Clamping assembly with self-clamping jaws, in particular for a linear hydraulic winch |
| 06/05/1991 | EP0429811A1 Lifting apparatus for hollow building blocks |
| 06/05/1991 | CN2078356U Fully wet type concrete injector |
| 06/05/1991 | CN1012745B Reinforcing rod holder for use in joining cast concrete work |
| 06/04/1991 | US5020355 Method and apparatus for securing first and second members |
| 06/04/1991 | US5020288 Method to protect glass in doors and windows from scratches, abrasion, and painting processes |
| 05/28/1991 | US5018923 Automated bricklaying apparatus |
| 05/23/1991 | DE4036919A1 Protective cap for reinforcing rod end - comprises end and neck of polymer concrete enclosing cast plastics sleeve |
| 05/22/1991 | EP0428090A1 Safety device |
| 05/22/1991 | EP0428028A1 A poker vibrator for compacting concrete |