Famous Patents
3M employee and church chorister Art Fry needed something to temporarily mark pages in his hymnal. He was in luck because his colleague, Spencer Silver, accidentally developed a glue that was too weak for other purposes. After initially discouraging consumer response, Post-it Notes became a hit in 1979.
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| Number | Title | Issue Date |
| 5147459 | Cementitious products Macro defect free cementitious products are obtained by curing or firing a cementitious composition comprising water, a reactive filler and a water soluble alkali metal silicate. The products show good strength and heat and water stability, by contrast wi... | 09/15/1992 |
| 4820144 | Tile making machines A tile making machine in which tiles are formed on pallets conveyed in succession through the machine has laterally spaced, longitudinally extending tracks for supporting the pallets. The pallets can be supported at different heights by the provision of a... | 04/11/1989 |
| 4673659 | Lightweight concrete roof tiles Lightweight concrete roof tiles are produced by extruding a cement/lightweight aggregate/water mix containing a non-thixotropic silica fume in a weight ratio of silica fume (calculated as dry weight) to cement of about 2:98 to about 25:75, preferably abou... | 06/16/1987 |
| 4666648 | Method and apparatus for manufacturing roof tiles A roof tile (9) having contoured interlocking regions (20) along its side edges is provided with a plurality of relatively shallow closely spaced, longitudinally extending grooves on its upper surface (19) and optionally upwardly extending grooves on its ... | 05/19/1987 |
| 4622789 | Roofing systems A roofing system includes a filler member (12) engaging the under sides of the tiles (3) at the eaves of the roof. The filler member (12) is carried by a strip (13) which is pivotable on a spacer member (4), having ventilation apertures (6), the spacer me... | 11/18/1986 |
| 4332117 | Verge and soaker systems A verge or soaker system for a pitched roof having a number of overlapping tiles or other individual roofing units. The system comprises a plurality of overlapping, individual members. Each member has a channel adapted to cap the upper and lower faces of ... | 06/01/1982 |
| 4322924 | Roof ridge capping An elongate roof ridge capping member for a tiled roof includes a pair of longitudinally extending flanges interconnected by a capping section. The capping section is connected to at least one of the flanges by a re-entrant portion, being so connected to ... | 04/06/1982 |
