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 |
| 6619423 | Measuring device for measuring the elastic properties of a surface structure A measuring device for measuring the elastic properties of a surface structure (3), comprising a probe (2) arranged within a housing (1), a transmitter and at least one receiver, the transmitter transmitting acoustic pulses and the receiver picking up the... | 09/16/2003 |
| 5470349 | Device for treating inflammatory skin changes in the initial stage, and method for using same This device for treating skin conditions with galvanotherapy features a DC power supply, one pole of which is connected to a central pin electrode. The other pole is connected either to several counter-electrodes arranged around the central electrode, or ... | 11/28/1995 |
