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 |
| 7207398 | Steerable rotary drill bit assembly with pilot bit A rotary drill bit assembly suitable for directionally drilling a borehole into an underground formation, the drill bit assembly having a bit body extending along a central longitudinal bit-body axis, and having a bit-body face at its front end, wherein an annular p... | 04/24/2007 |
| 5875860 | Drill for making a pole in the ground and a method for applying such a drill Drill for making a pole in the ground, whereby this drill (9) is provided with a passage (15) and whereby this drill has at the bottom a screw-shaped displacement part (11) of which the outside increases in radius upwardly, up to a diameter larger than th... | 03/02/1999 |
| 4446935 | Intermittent high-drag oil well drilling bit Methods and apparatus are disclosed for the rapid and efficient drilling of oil well and other types of bore holes through tough abrasive underground formations, which methods and apparatus utilize high drag intermittent contact and cooling techniques to ... | 05/08/1984 |
| 4405177 | Apparatus for finishing surfaces An apparatus for finishing a surface, e.g., for erasing line markings on a road, includes a rotor assembly rotatably mounted on a wheeled frame and including a rotor drivable to rotate about its own axis and a plurality of rotary scrapers mounted in angul... | 09/20/1983 |
| 4371210 | Freely rotatable pick bit holder on rotary driven member and method Disclosed herein is a new method and improved apparatus for digging and mining earth formations, especially coal formations. A mining or excavating machine having a movable frame with a drive means mounted on the frame is provided with a rotatable structu... | 02/01/1983 |
| 4275928 | Planing apparatus with bridging cutters Planing apparatus is disclosed having a rotatable cutting drum comprising a central, rotatable support, a plurality of secondary supports spaced around the central support and in parallel relationship thereto, and a plurality of apertured cutting members ... | 06/30/1981 |
| 3975056 | Longwall canted drum mining machine A side excavating machine comprising a rotatably driven cylindrical drum adapted to advance generally endwise along a pre-existing working face, but angled so that trailing portions of the drum project beneath the plane of the pre-existing face. The drum ... | 08/17/1976 |
| 3967854 | Endless bucket type excavator Each bucket includes a ground engaging leading portion characterized by roller cutter means alternating with scoop teeth transversely across the bucket. The scoop teeth on alternate buckets follow the path of roller cutter means on intermediate buckets. T... | 07/06/1976 |
