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 |
| 5504971 | Vacuum cleaner with adjustable speed power assist A self propelled upright vacuum cleaner drive system integral with the axle of the drive wheels including an operator controlled reversing clutch transmission incorporating a separate unidirectional AC motor for forward and reverse control of the drive sy... | 04/09/1996 |
| 5467502 | Height adjusting system for upright vacuum cleaner An upright vacuum cleaner including a canister assembly pivotally connected to a nozzle assembly and an extensible hose which forms part of the vacuum path between the nozzle assembly and the canister assembly and which can be disconnected from the nozzle... | 11/21/1995 |
