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 |
| 7059877 | Latch mechanism for electrical connector An electrical connector housing of the type having a spring biased housing cover for closing the electrical connector receptacle is provided with a lever actuated latch for holding the cover in an open position against the spring force. ... | 06/13/2006 |
| 6579054 | Shape-modifiable transition chute for trailer tipper A trailer tipper is disclosed for dumping material from the rear of a trailer which includes a main frame, a tipping deck mounted at one end of the main frame for supporting the trailer during pivotal movement of the tipping deck from a lowered position t... | 06/17/2003 |
| 6558103 | Container unloading apparatus An apparatus for unloading packages, parcels, postal items, baggage, etc., from a container having an open side. The apparatus has a sliding wall that is disposed over the open side of the container when the container is receiving within the apparatus. Th... | 05/06/2003 |
| 6019568 | Spill gate for trailer tipper A portable, low-profile tipper, for dumping the contents from a trailer containing dumpable material, includes a towable, elongated frame having a back end with a deck pivotally attached thereto. The deck has a backstop for positioning the trailer during ... | 02/01/2000 |
| 5458451 | Trailer dumper A portable low-profile tipper for dumping the contents from a trailer containing a dumpable material, includes a towable elongated and angled frame having a portion resting on the ground during dumping for greater stability. A deck is pivotally attached a... | 10/17/1995 |
| 5344271 | Trailer dumper A portable low-profile tipper for dumping the contents from a trailer containing a dumpable material, includes a towable elongated and angled frame having a portion resting on the ground during dumping for greater stability. A deck is pivotally attached a... | 09/06/1994 |
| 5080548 | Trailer dumper A portable low-profile tipper for dumping the contents from a trailer containing a dumpable material, includes a towable elongated frame having a back end with a deck pivotally attached thereto. The deck has a backstop for positioning the trailer during d... | 01/14/1992 |