Did You Know...
...Chester Carlson was a patent agent who tired of having to make multiple copies of patent applications using the only duplication method available at the time: carbon paper. In 1959 he came up with a new copying system and took it to IBM for evaluation. The "experts" at IBM determined potential sales to be only 5,000 units because people wouldn't want to use a bulky machine when they had carbon paper. Carlson's invention was the xerography process, the company founded on the system is Xerox.
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| Number | Title | Issue Date |
| 7373796 | Automatic releasing-type rolling head for forming tapered thread on pipe The invention is aimed at the provision of an automatic releasing-type rolling head for forming a tapered thread on a pipe in which the shock generated at the end of the thread rolling operation is alleviated and a thread automatic rolling roller retracting mechanis... | 05/20/2008 |
| 4944639 | Thread cutting device A thread forming method and apparatus particularly suited for cutting tapered threads on round stock. The apparatus power feeds and rotates retreating die elements and includes mechanisms for quickly extending and retracting the die elements at the start ... | 07/31/1990 |
| 4880340 | Screw cutter die head A screw cutter die head comprising an annular body portion, a ring member formed with several cam ridges and angularly movable relative thereto and several chasers held by said body member to be radially movable by engagement of a cam recess formed in eac... | 11/14/1989 |
| 4396316 | Die-head of machine tools A die-head of a cutting machine having a pair of relatively rotatable annular plates which retractably hold therebetween cutting tools extending in radial directions, one of the plates being provided with a tool retracting lever which is pivotably mounted... | 08/02/1983 |
| 4329093 | Die-head of cutting machine A die-head of a cutting machine comprising a pair of relatively rotatable annular plates which movably hold cutting tools therebetween, a tool retracting lever with a stop, pivotally connected to one of the annular plates, a slide integrally connected to ... | 05/11/1982 |
| 4288181 | Die-head of cutting machines A die-head of a cutting machine having a pair of relatively rotatable annular plates which retractably hold therebetween cutting tools extending in radial directions, one of the plates being provided with a tool retracting lever which is pivotably mounted... | 09/08/1981 |
| 4068977 | Tapping head A tapping head with chasers of different pitches is described. The head comprises a block in the form of a hollow cylinder with a plurality of radial grooves in which chasers of different pitches are movable. The tapping head constitutes the main componen... | 01/17/1978 |
