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 |
| 8113441 | Lap joint A lap joint assembly that includes two spaced apart mating railroad end sections that are double bent and machine tapered and trimmed to conform in spatial alignment with one another, an electrical insulating material positioned between the two machined mating rail ... | 02/14/2012 |
| 7090143 | Rail joint bars and rail joint assemblies A rail joint assembly is provided for joining abutting railroad rails with an electrically-insulated joint. The rail joint assembly comprises abutting railroad rails compressing an insulating gasket therebetween and rail joint bars secured through a plurality of hol... | 08/15/2006 |
| 4773590 | Separated end post joint An apparatus for electrically insulating a pair of adjacent rail sections that form separate electrical signal circuits includes a pair of electrically insulating end posts positioned in a space provided between the adjacent rail sections. A metallic sepa... | 09/27/1988 |
| 4527736 | Elastomeric railway-rail mount A mount for a railroad rail having an inner side turned toward another such rail and an outer side turned away from the other rail has a one-piece base supported on the ground under the one rail and formed with an upwardly open recess having inner and out... | 07/09/1985 |
| 4466570 | Multi-segment electrically insulated rail joint An insulated joint is provided for use between sections of rail that are disposed in adjacent signal circuits. The insulated joint includes a separator disposed between a pair of dielectric end posts. The end posts have a plan configuration substantially ... | 08/21/1984 |
| 4209130 | Adhesive tape for protecting electrically insulated rail joint An electrically insulated rail joint is protected from electrical shorting by laying an adhesive tape against the undersides and around the toes of the rails across their juncture. The adhesive tape has a thin plastic film backing which is exceedingly str... | 06/24/1980 |
