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 |
| 6000564 | Roller equipped uncoupling cam An uncoupling cam is incorporated into a hook-type coupler. Couplers of this variety are typically found on railway transit vehicles, one hook-type coupler being fixed to each end of each transit vehicle. Moving two transit vehicles toward each other so t... | 12/14/1999 |
| 5954211 | Roller equipped uncoupling cam A hook-type coupler for attachment to an end of a railway transit vehicle for joining adjacent ends of a pair of railway transit vehicles wherein the hook-type coupler has a hook member pivotally mounted therein being pivotal between a latch position and ... | 09/21/1999 |
| 5499728 | Electrically operated hook coupler with manual override An electrically operated hook-type coupler for attachment to an end of a railway transit vehicle for joining adjacent ends of a pair of such railway transit vehicles, in which a gathering core is provided at the forward end of a coupler head, with a hook ... | 03/19/1996 |
| 5316158 | Coupler structure for model trains with centering cavity and surfaces An improved coupler structure is intended for use on model railroad rolling stock. The coupler structure includes a coupler having a shank and a joining mechanism for joining to a companion coupler on another piece of rolling stock located at one end of t... | 05/31/1994 |
| 5014864 | Conveyor system A conveyor system, in particular a suspension conveyor system, comprising at least two transport units adapted to be moved on rollers and interconnected by a disconnectable coupling, the coupling including two identically formed hooks which are each provi... | 05/14/1991 |
| 4984696 | Railway coupler head strengthened at horn line An improved railway coupler head is provided having a modified lock chamber which is asymmetrical about its longitudinal center line such that the rear horn wall has a greater length on the guard arm side than the knuckle side of the longitudinal center l... | 01/15/1991 |
| 4627545 | Car coupler with enlarged gathering zone A hook-type railroad car coupling includes a hook vertically centered and laterally offset in a pocket opening in the front face and a guide pin and hole at opposite top corners. At one side of the bottom a guide horn extends beyond the hook, the front pl... | 12/09/1986 |
| 4073385 | Car coupler An automatic coupler for railway and other vehicles which includes an outer housing carried by the vehicle and formed of a plurality of welded metal plates, with a spring urged coupler hook mounted therein for horizontal pivotal movement for engagement wi... | 02/14/1978 |
