Did You Know...
...that while attempting to develop a super strong glue, 3M employee Spencer Silver accidentally developed a glue that was so weak it would barely hold two pieces of paper together? However, his colleague Art Fry needed the glue. Fry sang with his church choir and marked the pages of his hymnal with small scraps of paper that often fell out. He used Silver's glue to hold the papers in place. Today we call this invention Post-it Notes.
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| Number | Title | Issue Date |
| D633630 | Building unit | 03/01/2011 |
| D615216 | Building unit | 05/04/2010 |
| D580561 | Pad for a seabed mat | 11/11/2008 |
| D575414 | Revetment block | 08/19/2008 |
| D571024 | Grid structure for stabilization of grass, turf or particulate material | 06/10/2008 |
| D571023 | Paver | 06/10/2008 |
| 7341401 | Subsurface drainage system and drain structure therefor A subsurface drainage assembly for directing fluid drainage from a surface. The subsurface drainage assembly includes a plurality of drain structure panels linked together in a manner that permits movement of one drain structure panel relative to the adjacent drain ... | 03/11/2008 |
| D555808 | Engagement projection of a retaining wall block | 11/20/2007 |
| D555809 | Paver | 11/20/2007 |
| D555810 | Mortarless retaining wall block | 11/20/2007 |
| D551358 | Building block | 09/18/2007 |
| 7229235 | Retaining wall system A retaining wall system is comprised of a plurality of courses of side-by-side parallelogram front face patterns, each parallelogram front face pattern formed by first and second rows of a plurality of quadrilateral face patterns. The first and second rows of the pl... | 06/12/2007 |
| D540476 | Column forming block | 04/10/2007 |
| D540475 | Column forming block | 04/10/2007 |
| D532119 | Wall block | 11/14/2006 |
| D528223 | Retaining wall block | 09/12/2006 |
| D527113 | Block design for retaining wall | 08/22/2006 |
| D516736 | Support block with long wings | 03/07/2006 |
| D514232 | Retaining wall block | 01/31/2006 |
| D514233 | Wall block | 01/31/2006 |
| D512163 | Concrete form block | 11/29/2005 |
| 6960048 | Modular segmented retaining wall A modular retaining wall system uses a plurality of different sized masonry blocks to form uniform sized modules for constructing a segmented retaining wall. Each module has the same overall dimensions of height, width and depth, while the masonry blocks used to def... | 11/01/2005 |
| D510774 | Retaining wall block | 10/18/2005 |
| D510773 | Building block | 10/18/2005 |
| 6907705 | Reversible wall block, block wall, and method of wall construction A wall block, system, and method for creating a straight and/or curved wall such that the front and back sides of the wall will have generally the same appearance. The block is asymmetrical and is designed to abut the ends of like blocks that are upright or inverted... | 06/21/2005 |
| D504957 | Revetment block | 05/10/2005 |
| 6889479 | Building block Molded composite polymer construction blocks are made that are easily assembled, using alinement pins and apertures, with channels for insertion of sealant and vertical passageways for pipes, wires, etc. Stud supporting cavities in one side of the block extend into ... | 05/10/2005 |
| D502554 | Construction block | 03/01/2005 |
| D501935 | Wall block | 02/15/2005 |
| D501934 | Offset support block with flat face | 02/15/2005 |
| D498002 | Block for a flowerbed | 11/02/2004 |
| D491676 | Building block | 06/15/2004 |
| 6295772 | Modular masonry step and deck assembly The modular masonry step and deck assembly consists of a plurality of like-shaped risers and a plurality of like-shaped treads that enable the assembly to have a variety of shapes, sizes and heights to provide a custom fit to a variety of buildings, mobil... | 10/02/2001 |
| 5465541 | Building construction of longitudinal and cross hollow components A building construction of longitudinal and cross hollow components includes building unit bodies each of which consists of joggles, scarfs, extension paths and wiring holes, such that, after a plurality of such unit bodies are formed into a wall, it form... | 11/14/1995 |
| 5465542 | Interblocking concrete form modules Interlocking concrete form modules (21) suitable for creating a concrete wall form is disclosed. The modules (21) have the general shape of a right rectangular parallelepiped with parallel side walls (23a, 23b) joined by integral webs (25a, 25b, 27a, 27b,... | 11/14/1995 |
| 5379565 | Element and method of construction without mortar Element of construction designed to be laid without mortar comprising a block (B1-B4) with six faces (1-6) opposite two-by-two and of which at least one face (1, 2) is punched so as to form open internal cells (7, 7a, 7b, 7c) separated by walls (8), chara... | 01/10/1995 |
| 5131202 | Building block A building block, at least one face of which has a recessed surface along at least a portion of its periphery. The recessed surface is of non-uniform width and, at least in part, defines a surface of irregular shape. Each remaining face of the block has a... | 07/21/1992 |
| 5017049 | Composite masonry block Disclosed is a composite masonry block comprising a substantially rectangular body having a bevelled surface and an interlocking flange. Also disclosed are structure made form the masonry block and methods of making the block.... | 05/21/1991 |
| 4787189 | Building blocks A building construction comprised of blocks of substantially rectangular prismatic configuration. The first pair of opposite edges of the blocks are each formed with a first tongue and a first groove of complementary configuration extending in parallel re... | 11/29/1988 |
| 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 |
