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 |
| 6640388 | Assembly for transit car door hanger A hanger bar assembly for sliding doors used in transit cars has at least two separate coaxially oriented, preferably tubular bearing segments which can slidingly engage a cylindrical rod secured above an entry portal of a transit car. Each bearing segmen... | 11/04/2003 |
| 5735155 | Method for manufacturing patterned tread plates A method for manufacturing patterned tread plates including the steps of providing a press having a path for advancing a sheet therethrough, the press being equipped with a progressive die including a plurality of gaggable dies and punches arranged in a p... | 04/07/1998 |
| 4854078 | Curved sliding door assembly and method of repair A curved sliding door assembly for a transit vehicle such as a subway car which is particularly useful in retrofitting many cars having prior art hanger assemblies which employ a split tube having three circumferentially spaced raceways therein and which ... | 08/08/1989 |
