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 |
| 7075195 | Electrical safety lockout mechanism for power tools and other hazardous machinery An improved electrical lockout mechanism includes a first connection means to a power source, and a second connection means to a power input terminal of the machine being protected. The machine includes a manually-operated ON/OFF switch. A switching element, which i... | 07/11/2006 |
| 4578006 | Impeller under file machine Apparatus for underfiling curvelinear vanes of cast centrifugal impellers. Such vanes are cast with generally uniform thickness along their length; it is desirable to have the vanes taper in thickness such that the radially outward portions are thinner th... | 03/25/1986 |
| 4460297 | Orbital method and apparatus for making helical races Cutting apparatus forms helical races in a workpiece defining a toroidal envelope having an axis of symmetry and a circular axis perpendicular to the axis of symmetry and defining a diametric plane through the envelope by rotating the workpiece about the ... | 07/17/1984 |
| 4380412 | Lap shaping machine with oscillatable point cutter and selectively rotatable or oscillatable lap Programmable electric and hydraulic machine for shaping laps such as are used to form or polish opthalmic lenses, comprises vertically oscillatable, longitudinally displaceable arm carrying a point cutter which is functionally engageable by radially exten... | 04/19/1983 |
