Did You Know...
...that several people are credited with the invention of the flush toilet? Most people have heard of Thomas Crapper (1837-1910), the sanitary engineer who invented the valve-and-siphon arrangement that made the modern toilet possible. Another claimant to "the throne" was British inventor Alexander Cumming who patented a toilet in 1775. Then there's a nameless Minoan (a native of ancient Crete) who lived 4,000 years ago who supposedly was ahead of his time and created the first flush toilet!
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| Number | Title | Issue Date |
| 4812087 | End mill cutting tool and indexable insert therefor An end milling tool having a positive axial rake angle in side elevation to facilitate removal of chips from the surface of a workpiece and a curved cutting edge having a neutral (zero) to positive rake angle in bottom plan view as it progressively cuts t... | 03/14/1989 |
| 4794836 | Honeycomb core cutting tool The invention is a honeycomb core cutting tool wherein a primary cutter is used to cut the core to shape and secondary cutters are used to immediately shred that portion of the core being removed. The primary cutter is typically a commercially available c... | 01/03/1989 |
| 4693641 | End mill with throw-away tip An end mill comprises an end mill body and a throw-away tip mounted on a forward end of the end mill body so as to be spaced from an axis thereof. A core receiving recess is formed at a center of a forward end face of the end mill body and has a size equa... | 09/15/1987 |
| 4681485 | End mill cutting tool and indexable insert therefor An end milling tool having a positive axial rake angle in side elevation to facilitate removal of chips from the surface of a workpiece and a curved cutting edge having a neutral (zero) to positive rake angle in bottom plan view as it progressively cuts t... | 07/21/1987 |
| 4628976 | Wood surfacing blade A blade for use in shapers, planers, and the like for the shaping and surface finishing of wood. In contrast to prior art blade shapes wherein a sharpened cutting edge is scraped across the wood resulting in rapid wear of and damage to the blade, the pres... | 12/16/1986 |
| 4572714 | Router bit A router bit comprises a shank and a fluted portion, for example two or four fluted bit. The two fluted bit comprises two upper cutting edges higher than a predetermined standard line and two lower cutting edges lower than the standard point. Helixes of t... | 02/25/1986 |
| 4560308 | Cutting tool A rotary cutting tool of the type comprising an elongated cylindrical body having a central axis about which it is rotated for performing cutting or material removal operations during relative movement in directions perpendicular to its axis of rotation. ... | 12/24/1985 |
| 4541757 | Propellant milling tool, butterfly cutter A cutting tool for milling solid propellant for rocket motors includes a cutting arm that is fixedly attached at a center location to a rotatable arbor or shaft. The cutting arm has a cutting blade and inwardly located hole at each end with each of the bl... | 09/17/1985 |
| 4497600 | End mill An end mill has a plural number of helical blades formed on the main body of a machine tool. Each of the blades is provided with a plural number of notches spaced along its length and shifted relative to the corresponding notches in the preceding blade. W... | 02/05/1985 |
| 4475850 | Split helix router bit A router especially adapted for cutting plastic fibrous materials cleanly. The router design is a cylindrical body having two sets of cutting edges extending the full length of the bit except for the shank. The cutting edges are helically oriented along t... | 10/09/1984 |
| 4461602 | Milling cutter A milling cutter consists of a shaft 10, a cutter plate 12 and a screw bolt 14 by means of which the cutter plate 12 is detachably fastened at the front end of the shaft 10. The latter has a recess in the front face thereof. The recess is defined by three... | 07/24/1984 |
| 4338050 | Method and tool for generating holes in composite materials A method and tool for drilling holes in a composite of materials having different strength and elastic characteristics. The tool has a planar end surface inclined in two directions relative to the tool axes, and an axially-extending flute which define, wi... | 07/06/1982 |
| 4300862 | End milling tool An end milling tool has a main body formed at its front end with a long main cutting end edge extending generally radially from the outer periphery of the main body approximately to the center of the main body and with a short auxiliary cutting end edge e... | 11/17/1981 |
| 4284406 | Dental tooth bur A dental tooth bur includes a plurality of flutes longitudinally disposed at one end of a shank and adapted to produce a prepared cavity having a wall that has a plurality of generally microretentive ridges in its lower portion and that is generally smoot... | 08/18/1981 |
| 4274771 | Boring reamer with end mill cutters A boring reamer with end mill cutters comprising a cutting edge portion, a straight shank and a taper shank. The cutting edge portion is formed at the forward edge of the straight shank, and has, at its forward end, end mill cutters each of which is forme... | 06/23/1981 |
| 4244669 | Cutter head for cutting templates from cardboards, plastics, and the like A cutter head for cutting templates from cardboards, plastics, and the like, which includes a high speed rotatable cutting stylus, and a holding-down device for holding down the material from which the templates are to be cut out. The holding-down device ... | 01/13/1981 |
| 4227837 | Router bit A router bit is provided with an even number of paired cutting edges. Each pair of cutting edges has opposite helix hands at the same helix angle with respect to the axis of rotation and a portion where the pitch of the cutting edge is constant when the c... | 10/14/1980 |
| 4212568 | Cutting tool A rotary cutting tool blank comprises a cutting portion having a longitudinal axis and a plurality of teeth extending the length of said cutting portion, with each of the teeth having a cutting face and a trailing face and a land surface bridging the cutt... | 07/15/1980 |
| 4175896 | Ball endmill A ball endmill comprises a cylindrical body and a cutting element secured to one end of the cylindrical body. The face of the cutting element is convexed and forms a part of the surface of an imaginary cone, the axis of which is inclined to the axis of th... | 11/27/1979 |
| 4145159 | Bit for electric drills The present invention relates to an improved drill bit. In the present invention there are disposed opposite each other on a shank a cutting blade with no relief and a post. The post prevents a center swing and is of a small diameter equivalent to a cutti... | 03/20/1979 |
| 4132493 | Ball end mill A single-toothed ball end mill provided with a cutting edge including a starting end, positioned near the center of rotation of the end mill and having an upright portion. The cutting edge is defined by a line curved outwardly in the direction of rotation... | 01/02/1979 |
| 4050840 | Radially adjustable rotary cutting tool A radially adjustable rotary cutting tool such as a rotary reamer or the like. The tool head has a generally cylindrical body with a shank at one end and a radially slotted cutting head at the other end. The cutting head has a central axially extending th... | 09/27/1977 |
