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 |
| 5704570 | Welded nose rail used for crossing A nose type rail member for a crossing member applied to a turnout or wayside switch system on the ground for a train and the like, is made of high carbon steel material containing 0.70 to 0.82 wt. % of carbon. The rail member is constructed by a pair of ... | 01/06/1998 |
| 5366184 | Seat for the movable point in a cradle of a crossing frog incorporated in long welded rails and process for the production of such a seat The present invention relates to a seat for the movable point in a cradle of a crossing frog incorporated in long welded rails and the process for production of such a seat. The seat is characterized in that the connection between the movable point (1) an... | 11/22/1994 |
| 4785994 | Sliding joint for welded rail sections A sliding joint of the type designed to permit expansion and contraction between adjoining ends of rail sections in a single or double track system is characterized by having a rail point defining an extension of one adjoining end which is both lengthened... | 11/22/1988 |
