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...that after Walter Hunt patented the safety pin in 1849, he sold the rights to it for $400?
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| Number | Title | Issue Date |
| 7516587 | Interlocking floor system Multiple polymeric panels molded as a rigid integral body having a planar top surface and a bottom grid structure are interlocked together mechanically along side edges. Each side edge has alternating upwardly and downwardly facing steps with concave dimples on one ... | 04/14/2009 |
| 7229232 | Reinforced mat for unstable surfaces Terrain often hinders wheeled vehicles as cars mire in sand and wheeled carts in mud. Beaches, sandy playgrounds, and mud inhibit travel of wheelchairs. A reinforced mat upon a lattice of projections provides a stable surface for wheels and wheelchairs. The projecti... | 06/12/2007 |
| 7210876 | Rollable load bearing mat for turf areas A rollable load bearing mat for protecting turf areas from damage caused by weight bearing loads, such as vehicle or pedestrian traffic, configured from a plurality of interconnected mat units having a plurality of spaced apart cell rows comprising a plurality of ge... | 05/01/2007 |
| 7174687 | Web offset lug dry-stack system Generally, the invention is a dry stack building block for constructing a masonry wall. The dry stack unit has a front section having an outer surface, an inner surface, a bottom surface, and a top surface. The dry stack unit also has a rear section substantially pa... | 02/13/2007 |
| 7155865 | Prefabricated housing structure A housing structure includes a first plurality of wall panels which form a lower course and a second plurality of wall panels which form an upper course. Each of the wall portions is generally rectangular and includes integrally formed interlocking portions which fa... | 01/02/2007 |
| 7118442 | Construction members for three-dimensional assemblies A construction member, comprising an elongated body having a longitudinal dimension with a first end and a second end. Complementary end rotational joint portions are provided at the first end and at the second end of the elongated body, for interconnecting first en... | 10/10/2006 |
| 7028434 | Spillage control safety floor matting A thin flexible floor mat system is configured to resist penetration by high heeled shoes and be capable of being easily rolled up in long segments. The floor mat is constituted by a series of small square sections and are connected together with connectors that per... | 04/18/2006 |
| 6962028 | Interlocking masonry articles and methods thereof Each of a plurality of masonry article comprises a contoured first header, a contoured second header, a contoured front face, a back face, a contoured lower base and an upper base. The plurality of masonry articles has a plurality of holes extending from the lower b... | 11/08/2005 |
| 6925770 | Interlockable element for structure assembly set An interlockable element for a structure assembly set includes an at least partially planar body and a connector edge having associated therewith a first A-type and B-type connector pair disposed about a first axis of rotation and a second A-type and B-type connecto... | 08/09/2005 |
| 6915613 | Collapsible concrete forms A concrete form unit includes opposing sidewalls which are preferably made of foamed plastic or other insulating material. Articulated spacers extend between and connect the sidewalls, and are capable of folding about themselves both at an elbow situated between the... | 07/12/2005 |
| 6820384 | Prefabricated foam block concrete forms and ties molded therein A foam block concrete form having a pair of opposing foam panels spaced parallel from each other, and retained in opposing fashion by a plurality of transverse ties therebetween. Each panel has opposing longitudinal edges having engaging means formed therealong for ... | 11/23/2004 |
| 6782672 | Sandwich panel structural joint A sandwich panel structure comprises a slotted panel and a tabbed panel. The slotted panel includes a slotted panel core body and a first slotted panel facesheet. The slotted panel core body defines a first slotted panel side with the first slotted panel facesheet d... | 08/31/2004 |
| 6751912 | Modular tile and tile flooring system A tile flooring system composed of modular interlocking tiles. Each modular interlocking tile is adapted to be coupled to another modular interlocking tile. Each tile includes a body having a playing surface, two male interlocking sides, and two female interlocking ... | 06/22/2004 |
| 6665993 | Interlockable element for structure assembly set An interlockable element for a structure assembly set includes an at least partially planar body and a connector edge having associated therewith a first A-type and B-type connector pair disposed about a first axis of rotation and a second A-type and B-ty... | 12/23/2003 |
| 6578324 | Spillage control safety floor matting A thin flexible floor mat system is configured to resist penetration by high heeled shoes and be capable of being easily rolled up in long segments. The floor mat is constituted by a series of small square sections and are connected together with connecto... | 06/17/2003 |
| 6493996 | Modular building construction system A prefabricated room module (1) is provided for use in the construction of a modular building. The room module comprises a floor slab (2) of generally rectangular shape in plan, and load bearing walls (3,4) formed at adjacent sides of the slab and mutuall... | 12/17/2002 |
| 6405495 | Spillage control safety floor matting A thin flexible floor mat system is configured to resist penetration by high heeled shoes and be capable of being easily rolled up in long segments. The floor mat is constituted by a series of small square sections and are connected together with connecto... | 06/18/2002 |
| 6357194 | Tapered dovetail joint The tapered dovetail joint is a method of joining two boards, or other rigid materials such as particleboard, wafer board, etc., by a unique type of modified dovetail joint. The modification to the classic dovetail joint includes tapering the dovetail pin... | 03/19/2002 |
| 6253520 | Interlocking components and assembly system A structure for use in structural, load bearing construction is made from cold rolled shapes and/or shaped from structural grade sheet metals or structural shapes. The structure includes interlocking box trusses containing core members held by four web me... | 07/03/2001 |
| 6176059 | Modular concrete building system A modular construction system and method of use for creating a concrete wall system which has a wall system which complies with a modular construction system. The system uses wall form panels having connectors and structural tie plates. The wall form pane... | 01/23/2001 |
| 6125607 | Wood article and method of manufacture A wood member comprises first and second opposed members made of wood and secured together. Each of the first and second members has spaced sides and a surface extending between the sides. The surfaces include a first portion contoured to define a contact... | 10/03/2000 |
| 5992105 | Spillage control safety floor matting A thin flexible floor mat system is configured to resist penetration by high heeled shoes and be capable of being easily rolled up in long segments. The floor mat is constituted by a series of small square sections and are connected together with connecto... | 11/30/1999 |
| 5907934 | Interfacing floor tile An interfacing floor tile in the form a right triangle with two adjacent sides of equal length is provided with elongated third side opposite the right triangle. Each side is formed with a row of female cavities located adjacent the sides and positioned t... | 06/01/1999 |
| 5806273 | Multi-storey concrete construction system A concrete construction system enabling the construction of multi-storey buildings using single storey wall panels and elevated flat slabs is provided. The invention provides a plurality of concrete panels of a uniform thickness, the plurality of concrete... | 09/15/1998 |
| 5775046 | Modular construction member Construction member panels have an array of engaging elements and cooperating receiving spaces, such as dovetails and dovetail shaped keyways. The engaging elements are relatively closely spaced such that a pair of such panels can be meshed together, and ... | 07/07/1998 |
| 5508902 | Methods and apparatus for the interlocking of parts by a tab-and-slot arrangement First and second parts of a metal reflector of a light fixture are interconnected by tab-and-slot arrangements. The first part has hook-shaped tabs and an abutment tab projecting from an edge thereof. The second part has slots for receiving respective tab... | 04/16/1996 |
| 5379557 | Architectual panel system for geodesic-like structures An architectural panel system for assembling geodesic-like structures in which three or more corrugated panels of relatively thin material are joined along their sides to form a polyhedral angle. The corrugations may be formed in the panel surface or alon... | 01/10/1995 |
| 5052158 | Modular locking floor covering An improved modular and cushion forming interlocking floor covering which is light weight, easy to assemble, disassemble and to store is composed of a plurality of panels. Each panel includes interlocking means composed of spaced locking fingers and locki... | 10/01/1991 |
| 5035098 | Container block A molded container block for fluidic material is fabricated with opposing sides comprised of a plurality of offset parallel planes interconnected to form interfitting geometric surfaces to allow interlocking and nesting of a plurality of container blocks ... | 07/30/1991 |
| 4909718 | Structural unit, assembly and apparatus for molding same An insulated molded plastic structural unit includes spaced face portions, an intermediate portion and interlocking portions. The face portions each include an integrally formed stressed hard outer skin section and the intermediate portion includes an ins... | 03/20/1990 |
| 4887403 | Internally indexed building block and method of construction The internally indexed building block of the invention includes a body having opposed side walls and opposed end walls which define an internal cavity therebetween and upper and lower block faces. A web is located within the block internal cavity and divi... | 12/19/1989 |
| 4671039 | Block A building block for use in building a structure consisting of linear or stepped courses of a plurality of blocks is designed such that any two types are required, a full block and a half block. Each full or half block consists of a substantially parallel... | 06/09/1987 |
| 4635425 | Portable and modular dance floor A portable dance floor for use on a stationary floor surface is formed of a plurality of like elements each comprising vertically spaced upper and lower similar rectangular panels having straight edges, and at least an upper and a lower set of parallel an... | 01/13/1987 |
| 4633639 | Construction block A modular construction block comprising a configuration built up from five indentical rectangular sub-blocks dimensioned in the ratio of 1:2:4 and assembled into an "H"-shaped symmetric block about either of two vertical perpendicular planes through the c... | 01/06/1987 |
| 4584221 | Floor covering assembly By means of the coupling members and corresponding supporting feet of adjacent elements a coupling between an arbitrary number of elements of the floor covering assembly is possible. In order to prevent the separation of the engaged respective pairs suppo... | 04/22/1986 |
| 4575984 | Construction element A construction element for constructing a supporting floor or the like consists of a slab made of reinforced concrete. The side walls of the slab are provided with protection profiles connected with each other. Two series of aligned, alternating projectio... | 03/18/1986 |
| 4548008 | Tile panel having convex and concave portions around substrate board, and method for production thereof A novel prefabricated tile panel consisting of a rectangular or square substrate board having side-long rectangular convex and concave portions arranged regularly by turns around the sides of the rectangular or square shape and a multiplicity of tiles arr... | 10/22/1985 |
| 4475326 | Interlocking building blocks and system using the same A family of interlocking polyurethane foam building blocks configured similarly to conventional concrete building blocks. Tongues and grooves are formed on the end faces of a universal block in such a manner that the end faces of two identical blocks will... | 10/09/1984 |
| 4468910 | Mat module with ramp strip A floor mat assembly is disclosed which is molded from resilient plastic material, and made up of only two different elements, mat modules and ramp strips. The mat module comprises a rectangular shape with two adjoining edges, each of the edges having an ... | 09/04/1984 |
| 4436779 | Modular surface such as for use in sports A modular surface having an important use as a sports deck, and particularly for ball sports like tennis. The surface is built up of a number of generally square tiles in which the play surface is supported by a large number of support pegs intended to re... | 03/13/1984 |
