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 |
| 4989503 | Wind controlled roof ventilation system A wind-directed ventilator hood assembly for a narrow elongated air exit opening in the roof of a farm building spanning a long portion of the roof, including hood supporting uprights projecting upwardly from the air exit opening at plural spaced location... | 02/05/1991 |
| 4487112 | Chimney turncap A chimney turncap is provided with interior lower drains (14) for guiding condensed water to a collector tray (6) located in the warm zone of the chimney top, whereby the water disappears by evaporation. The hood portion (8) is a semitubular element havin... | 12/11/1984 |
| 4320697 | Chimney ventilating cap A chimney ventilating cap for the evacuation of combustion gas from chimneys. The cap comprises a spherical hollow dome body defined by a forward and a rear partly semi-spherical body portion. The front and rear body portions are secured together in a spa... | 03/23/1982 |
