| Patents for B28D 1 - Working stone or stone-like materials, e.g. brick, concrete, not provided for elsewhere; Machines, devices, tools therefor (14,003) |
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| 06/06/1991 | DE3939479A1 Machine for cutting objects on curved path - also cuts curve at right angles to first out to produce concave surface |
| 06/05/1991 | EP0430536A2 Drill |
| 06/05/1991 | EP0429893A1 Bushhammering device |
| 06/04/1991 | US5021262 Waterproofing/shaping of quarried building materials |
| 06/04/1991 | US5020945 Boring apparatus and method of modifying concrete blocks |
| 06/04/1991 | US5020606 Reciprocating rotary tool driver |
| 06/04/1991 | US5020280 Grinding tool and spacer assembly for use therein |
| 05/31/1991 | WO1991008093A1 A method for the production of composite panels based on ornamental stone or an equivalent material |
| 05/30/1991 | WO1991007263A1 Percussion sawing machine to saw stone blocks into slabs |
| 05/28/1991 | US5018504 Method and apparatus for cleaning used bricks |
| 05/28/1991 | US5018276 Tooth structure of rotary saw blade and method of forming the same |
| 05/22/1991 | EP0428476A1 Tubular drill |
| 05/22/1991 | EP0428070A1 Device for cutting tiles or plates |
| 05/21/1991 | US5016943 Milling device for cutting up road surfaces |
| 05/16/1991 | DE3937305A1 Guide rail for portable cut-off tool - has blade passing through slot in top hat section rail so that dust can be extracted from rail |
| 05/14/1991 | US5015128 Rotary drill apparatus |
| 05/14/1991 | US5014436 Circle cutting system |
| 05/08/1991 | EP0426007A2 Apparatus for loading and re-slicing semiconductor wafer |
| 05/08/1991 | EP0425802A1 Drilling device with percussive and rotative tool |
| 05/08/1991 | EP0425789A2 Rotary cutting blade |
| 05/08/1991 | EP0425518A1 A self-propelled apparatus for cutting asphalt and concrete. |
| 05/08/1991 | EP0299047B1 A sawing machine |
| 05/07/1991 | US5012792 Rotary blade and a rotary substrate for use in the rotary blade |
| 05/02/1991 | WO1991005929A1 Laminated tile and method for producing same |
| 05/02/1991 | WO1991005645A1 Apparatus for precision cutting of concrete surfaces |
| 05/02/1991 | WO1991005636A1 Abrasive cutting disc |
| 05/02/1991 | EP0424575A1 Shaft-integral type cutter wheel and cutter |
| 04/30/1991 | US5012067 Diamond cutting method |
| 04/25/1991 | DE4033108A1 Drilling rig with lightweight construction - is for drilling holes in concrete ceilings and has chassis mounted with higher output |
| 04/25/1991 | CA2006968A1 Shaft-integral type cutter wheel and cutter |
| 04/24/1991 | EP0423501A2 Cutter chain |
| 04/24/1991 | EP0321492B1 Chain saw |
| 04/24/1991 | CN1050836A Extra hard rock inserting diamond tool making method |
| 04/23/1991 | US5009553 Method and apparatus for drilling hardplate |
| 04/23/1991 | US5009440 Tool chuck for tool bits |
| 04/23/1991 | US5009138 Rotary cutter device |
| 04/23/1991 | US5009011 Annular saw blade and annular saw with driving means for a saw blade |
| 04/18/1991 | DE3938235A1 Cutting concrete horizontally - involves circular saw blade mounted on lower end of vertical shaft |
| 04/18/1991 | DE3933867A1 Drilling crown for drilling tube - has teeth welded at equal intervals around its leading edge perimeter and is then welded to tube |
| 04/17/1991 | EP0422610A2 Process and use of an apparatus for shaping the upper surface of articles, in particular stones, through burning or scabbling |
| 04/17/1991 | EP0422092A1 Tipped cutters |
| 04/17/1991 | CN2075129U Saw machine with circular disc for diamond |
| 04/16/1991 | US5007593 Apparatus for exposing the reinforcing bars of reinforced concrete pillars |
| 04/16/1991 | US5007207 Abrasive product |
| 04/10/1991 | EP0421753A2 Circular saw blade for cutting grooves in concrete |
| 04/10/1991 | CN2074706U Two direction marble cutter |
| 04/09/1991 | CA1282821C Drill braking system |
| 04/04/1991 | WO1991004144A1 Machining blade for a rotor of a surface roughening device |
| 04/04/1991 | DE3931987A1 Rounding and smoothing damaged paving stone edges - uses drum rotatable about slightly inclined, horizontal axis, fitted with follower on inner wall |
| 04/04/1991 | DE3928684A1 Sonotrode Sonotrode |
| 04/03/1991 | EP0420769A2 Method and device for cutting a mineral fibre board in a plane between faces |
| 04/03/1991 | EP0420414A2 Tool for breaking or scarifying surfaces |
| 04/03/1991 | EP0419971A2 Method and device for remote controlled working of concrete walls |
| 04/03/1991 | EP0419834A1 Device for the cutting of a workpiece by chip removal |
| 04/02/1991 | US5004512 Method of making a stone veneer panel |
| 04/02/1991 | US5004382 Portable |
| 03/27/1991 | EP0418915A2 Cutting apparatus |
| 03/27/1991 | EP0203123B1 Radially-operating roller/milling-cutter tool rotatably supported on a driven rotating eccentric |
| 03/27/1991 | CN2073806U Large-diameter diamond thin wall-drilling scooping tool |
| 03/27/1991 | CN1050154A Process for installation of expansion element |
| 03/27/1991 | CA2024958A1 Mineral fiber pannel slicing process and installation used thereof |
| 03/26/1991 | US5002139 Drilling tool |
| 03/26/1991 | CA1281879C Composite panel with a natural stone layer |
| 03/24/1991 | CA2026432A1 Apparatus for slicing a workpiece |
| 03/21/1991 | WO1991003361A1 Method and apparatus for cleaning used bricks |
| 03/21/1991 | WO1991003211A1 Process for producing a tooth crown with the aid of two sonotrodes, device for shaping workpieces using a sonotrode and process for making a sonotrode usable in dental technology |
| 03/20/1991 | EP0417644A2 Method of slicing cylindrical material into wafers |
| 03/20/1991 | EP0417420A1 Method for the fitting of an expansion element |
| 03/19/1991 | US5000631 Working tool holder for a drilling or chiseling device |
| 03/14/1991 | DE3927601A1 Top surface treatment for stone products - is for concrete-paving stones and involves milling machine to remove 3 mm from top surface within 24 hours of casting |
| 03/12/1991 | US4998981 Bit for drilling an undercut hole |
| 03/12/1991 | US4998775 Apparatus for precision cutting of concrete surfaces |
| 03/07/1991 | WO1991002626A1 Trimming up abrading discs |
| 03/06/1991 | EP0362292B1 Device to cut, drill or similarly machine rock, ore, concrete or similar |
| 03/05/1991 | US4997050 Scabbler bits |
| 03/05/1991 | US4997049 Tool insert |
| 02/28/1991 | DE4024298A1 Device for demolition of concrete - using high pressure liq. (water) jets, and is lightweight and easily transportable |
| 02/20/1991 | EP0413150A2 Milling depth display for a road milling machine |
| 02/20/1991 | EP0413129A2 Removal method and apparatus for fluids containing production residues |
| 02/20/1991 | EP0412980A1 Device for cutting stone |
| 02/20/1991 | CN2071575U Corrugated diamond cutting disc |
| 02/19/1991 | US4993894 Drill |
| 02/19/1991 | US4993299 Vertical gang saw apparatus |
| 02/13/1991 | EP0412439A2 Grinding tool and spacer assembly for use therein |
| 02/12/1991 | US4992011 Cutting and shaping tool |
| 02/12/1991 | US4992010 Masonry |
| 02/12/1991 | US4991475 Method and apparatus for sawing bar-shaped workpieces into slices |
| 02/12/1991 | US4991354 Abrasive saw adjustable workpiece supporting frame |
| 02/06/1991 | EP0411831A1 Cutting element for rotary drill bit with multilayer cutting surface |
| 01/31/1991 | DE4023395A1 Hollow granite box beam and method of forming - beam comprising of two elongated component blocks of granite each containing at least one flat surface having identical dimensions |
| 01/31/1991 | DE3923970A1 Endless saw in adjustable rotating frame - can cut accurate parallel or cone shaped holes for removing heavy contamination from inside nuclear containment vessels |
| 01/30/1991 | EP0410780A1 Improvements in shaping bodies |
| 01/30/1991 | EP0410038A1 Process and device for treating solid masses |
| 01/29/1991 | CA2022107A1 Shaping bodies |
| 01/23/1991 | EP0408860A1 Device for making an undercutting in a drilled hole |
| 01/23/1991 | CN2069779U Prestressed pipe pile-head cutting machine |
| 01/22/1991 | US4986252 Concrete walls |
| 01/16/1991 | CN2069346U Cutter for reinforced concrete circular pile |
| 01/15/1991 | US4985610 Cutting torch |
| 01/15/1991 | US4984369 Device for removing grout |