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 |
| 7165333 | Template and method of fabricating rafters A template and method for fabricating rafters. The template including a U-shaped component including a first arm with a slot, a second arm with a slot, and a base perpendicular to and connecting the first and second arms. The template also including an adjustable ma... | 01/23/2007 |
| 5979283 | Miter guide A miter guide for guiding a work piece along the cutting path of a saw blade or another working tool. The miter guide includes a guide bar which fits in a slot in the surface of a table, a fence for supporting the work piece, and a telescoping extension a... | 11/09/1999 |
| 5758428 | Rafter measuring and positioning template and method A rafter measuring and positioning template and method provides a device and method wherein a telescoping pole has rotatably and swivelably mounted on one end thereof a pad having a slide plate for juxtaposition to a ridge board, and, on the other end, a ... | 06/02/1998 |
| 5634279 | Orientation apparatus for planar-surface-mounted items An orientation apparatus for planar-surface-mounted items includes a base assembly and a first right triangle unit connected to a first end portion of the base assembly. A first pivot assembly pivotally connects the first right triangle unit to the first ... | 06/03/1997 |
| 5440818 | Versatile measuring device An improved versatile measuring device for measuring linear, and angular dimensions and defining relative positional parameters or coordinates between a plurality of lines, points, or surfaces on a plane and for determining and duplicating line lengths an... | 08/15/1995 |
| 4916822 | Angle and distance measuring instrument An angle measuring instrument provides two straight arms connected at one end for relative pivotal movement. A telescoping assembly includes two elongated telescoping members each providing a free end. The free end of one telescoping member is pivotally c... | 04/17/1990 |
| 4813149 | Level device A level device has an extendable body portion with a pair of pivotally mounted extendable swingers. The swingers may be adjusted to swing freely, or be locked at any desired angular position. A protractor scale on the pivot mount of each swinger provides ... | 03/21/1989 |
| 4472883 | Structural movement measuring device The specification discloses a device for detecting movement of two portions of a structure relative one another. The device comprises a first disc defining a radial scale and fixedly securable to the first portion of the structure and a second disc fixedl... | 09/25/1984 |
| 3991474 | Measurement tool The invention comprises a measurement tool. The measurement tool has a pair of elongated main measurement sticks which are slidably mounted to move longitudinally toward and away from one another. The main measurement sticks have indicia thereon to identi... | 11/16/1976 |