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 |
| 4751882 | Articulated lightweight piggyback railcar An articulated railcar for transportation of highway trailers is lightweight and has a deck height which permits heavy highway trailers to be carried without exceeding the maximum allowable center of gravity height above the top of the rail. The railcar c... | 06/21/1988 |
| 4557199 | Lifting structure for railway tank car The tank of a railway tank car is supported adjacent to its opposite ends on two truck-mounted underframes, each underframe including a pair of body bolster plates disposed in a plane substantially perpendicular to the longitudinal axis of the tank and ha... | 12/10/1985 |
| 4407203 | Railroad tank car lift lug A lift lug for receiving and securing a lifting device to a railroad tank car for re-railing the tank car. The lift lug includes a bolster pad mounted adjacent an end of the tank car and a vertically disposed bolster web, the bolster web having a substant... | 10/04/1983 |
| 4329927 | Railway car roping staple A roping staple (and lifting lug) especially for securing to the side sill of a railroad car. The roping staple is uniquely provided with the strength and accessibility required for modern day railroading and yet is suitable for economical construction.... | 05/18/1982 |
| 4290730 | Attachment for fork lift An attachment for a fork lift truck for opening and closing sliding doors such as railway freight car doors. The attachment includes a floor that can be engaged by the tines of the fork lift and two vertically spaced apart door engaging members mounted to... | 09/22/1981 |
| 4149644 | Fork lift truck attachment An attachment for a fork lift truck that facilitates opening and closing of railway freight car doors. The attachment includes a base plate which pivotally supports a push arm at each side thereof that is connected to means for providing a controlled shoc... | 04/17/1979 |
