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William F. Semple, a dentist, was awarded the first US Patent on chewing gum in 1869. His recipe contained powdered chalk.
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| Number | Title | Issue Date |
| 7357385 | Machining jig The invention provides a standardized machining jig to be used in a machining center for processing various works. A machining jig 1 mounted on an exchange table T1 of a machining center has a jig base 10 and a pallet 20, and the pall... | 04/15/2008 |
| 6234491 | Tool liner A liner for a power tool holder has a wall which defines an interior and an exterior periphery. The interior periphery is sized to receive a tool shaft and the exterior periphery is sized to fit within a tool holder. The liner protects the tool shafts fro... | 05/22/2001 |
| 6227549 | Insulated chuck jaw A chuck jaw that is configured and arranged to be used in combination with other chuck jaws for securely retaining a rotatable accessory, such as a drill bit, in position in a chuck assembly, where the chuck jaw includes a chuck jaw body that defines a ge... | 05/08/2001 |
| 5340128 | Wear-resistant chuck for driving hard-shank bits A chuck for driving drill bits an the like having shafts of hardened steel is provided with clamping jaws which at least at their clamping surfaces have a coating of diamond dust, so that they will have a resistance to abrasion that is greater than that o... | 08/23/1994 |
| 4669742 | Stud holder for a stud welder The stud holder has in the interior of the supply passage of the stud holder proximal to the workpiece side of the clamp jaws, a circular groove for engaging and holding a headlike enlargement of the stud in a plane perpendicular to the axis of the clamp ... | 06/02/1987 |
| 4632407 | Inside/outside chucking device For selective outside or inside chucking of a workpiece on a lathe use is made of a base unit split to provide a set of three or more holding segments capable of being either contracted for grasping the exterior of a workpiece or spread for grasping the i... | 12/30/1986 |
| 3947048 | Segmented circumferentially split collet pad with replaceable serrations A longitudinally sectioned collet pad having plural pad segments of the detachable type, such as are conventionally used in an expansible collet, is provided with a freely interchangeable liner for each pad segment. Fastening means secure each liner again... | 03/30/1976 |
