Famous Patents
3M employee and church chorister Art Fry needed something to temporarily mark pages in his hymnal. He was in luck because his colleague, Spencer Silver, accidentally developed a glue that was too weak for other purposes. After initially discouraging consumer response, Post-it Notes became a hit in 1979.
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| Number | Title | Issue Date |
| 7047782 | Method for roll forming, capable of preventing wrinkles and device therefor A die roll 3 comprises a core part 3a which is formed of an elastic material and faces a punch part 2a of a punch roll 2. The core part 3a presses a bottom portion 4b of a drawn portion 4 | 05/23/2006 |
| 6976371 | Portable food cooling container A portable refrigeration apparatus includes a base defining an open interior cavity. An electric refrigeration unit is operably disposed in the base for cooling the contents of the interior cavity. A food container is configured to be removably disposed within the i... | 12/20/2005 |
| 6926613 | Pool table assembly A pool table (10) having a plurality of corner assemblies (12, 14, 16, and 18) which allow the pool table (10) to be easily disassembled while concomitantly allowing the pool table (10) to be sturdy. ... | 08/09/2005 |
| 6082990 | Stent crimping tool A stent crimping tool for firmly and uniformly crimping a stent onto a balloon catheter. The stent crimping tool is constructed of three orthogonally arranged semi-circular shaped cams rotatably mounted on a common base. Two cams are disposed horizontally... | 07/04/2000 |
| 5875669 | Rolling method and rolling facility for manufacturing steel bars for concrete reinforcement The present invention provides a rolling method and apparatus for manufacturing concrete-reinforcing steel bars, wherein the invention provides for obtaining various concrete-reinforcing steel bars satisfying the required specifications for knot height wh... | 03/02/1999 |
| 5611190 | Metal rod and a method for manufacturing same The invention relates to metal rod with a substantially round cross section comprising at least six rows of ribs arranged in the surface spread over the periphery, the surface of which is preferably provided with six rows of ribs and the ribs of at least ... | 03/18/1997 |
| 5546781 | Process for the production of a toothed rack via cold forming, the rack produced thereby, and an apparatus for practicing the process Process for the production of a toothed rack via cold forming, the rack produced thereby, and an apparatus for practicing the process. The cold formed rack workpiece shows multiple traces of cold forming in the toothing direction. During the production pr... | 08/20/1996 |
| 5066212 | Apparatus for bending pipe An apparatus engages pre-cut lengths of heated thermoplastic pipe against a pair of eccentric wiper arms bending the pipes into elbows. The eccentric wiper arms have an eccentric portion and a constant radius portion. A bending form has an arcuate die ada... | 11/19/1991 |
| 4995252 | Method and apparatus for internally enhancing heat exchanger tubing A method and machine for forming internal enhancement ribs in heat exchanger pipe or tubing comprises a mandrel which is supported within the tubing and a plurality of opposed rotary dies which have their axes perpendicular to the tube axis so that they r... | 02/26/1991 |
| 4956987 | Rotary cutter for cutting a continuous corrugated strip A high speed rotary cutter includes a toothed counterwheel which has plural radial slots extending in the axial directions. First cutting blades are slidably received in the radial slots, each of which has a first cutting edge on its outer end. The first ... | 09/18/1990 |
| 4858457 | Machine and method for making concrete reinforcing bars A machine for making concrete reinforcing bars, known as rebars, from wire stock having a round cross section. A preform roller station cold works the round cross section of the wire stock into the shape of a polygon. A first form roller station cold work... | 08/22/1989 |
| 4779437 | Grooving and stamping method and apparatus The method and apparatus described herein produce a tubular shelf post having a plurality of spaced apart annular grooves along the length thereof and stamped indicia on the outside surface of the post at various groove locations. A grooving and stamping ... | 10/25/1988 |
| 4283824 | Method for manufacturing heat exchanger tubing In accordance with the teachings of the instant invention, methods and apparatus are set forth for the manufacture of discrete lengths of heat exchanger tubing comprised of a thin walled metallic tubular member having a plurality of spaced apart transvers... | 08/18/1981 |
| 4193282 | Rolling machine A rolling machine for reducing the cross-sectional dimensions of an elongate workpiece, such as a steel billet, has two pairs of alternately operating rolls, each of which is journalled in an individual roll carrier. Each carrier is rotated about a carrie... | 03/18/1980 |
| 4034587 | Concrete reinforcement rods The invention is concerned with a reinforcing rod for concrete and a rolling tool for making the rod. The rod has several cold rolled serpentine shaped ribs distributed around its periphery and extending generally in the axial direction.... | 07/12/1977 |
