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 |
| 5196705 | Sun exposure monitoring device A sun monitoring device has a sensing sheet mounted in a housing to receive incident sunlight through a UV pass filter. The sheet contains a dye which luminesces in response to the incident light in a wavelength range within the UV range, and emits light ... | 03/23/1993 |
| 5188368 | Electronic game apparatus An electronic game apparatus for determining the presence and optionally the identity of playing pieces. Each playing piece (10) is provided with a resonator circuit (12,14,16), which may be tuned so that each playing piece or type or piece has a unique r... | 02/23/1993 |
| 5082286 | Sensory games Electronic game apparatus comprising a board displaying discrete playing areas and a number of playing pieces. Transmit and receive coils are provided beneath the surface of the board, preferably at right angles to each other, and each playing piece is pr... | 01/21/1992 |
| 4981300 | Sensory games A sensory electronic game which includes a board having a number of defined positions each provided with an isotropic field sensor such as a reed switch which has open and closed positions depending upon the presence or absence of a magnetic field, and tw... | 01/01/1991 |
