Did You Know...
...that while attempting to develop a super strong glue, 3M employee Spencer Silver accidentally developed a glue that was so weak it would barely hold two pieces of paper together? However, his colleague Art Fry needed the glue. Fry sang with his church choir and marked the pages of his hymnal with small scraps of paper that often fell out. He used Silver's glue to hold the papers in place. Today we call this invention Post-it Notes.
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| Number | Title | Issue Date |
| 7299560 | Multi-purpose tool A multi-purpose tool includes a graduated extension pivotably and lockably connected to a leveling extension. The graduated extension includes graduations for measuring length, angles, pitch, or a combination of these measurements. Angles may also be measured with a... | 11/27/2007 |
| 7254898 | Multi-purpose speed square A multi-purpose framing square has an elongate blade having a T-shaped slot with an L-shape at the base of the T-shaped slot. A handle has a top end has a handle thumbscrew hole. The handle is boltably attached through the handle thumbscrew hole to the blade through... | 08/14/2007 |
| 7178252 | Pipe fitting aligning device A pipe fitting aligning device having at least one square block assembly slidably positioned on a reference tool. The square block assembly includes a slot with a vertical scale extending therefrom. The device may include at least one compass assembly slidably posit... | 02/20/2007 |
| 7159328 | Measurement gauge incorporating a level Apparatus 10 discloses a handle 32 for manipulating the device and an extending rule portion 18 having a series of markings or measurements 26 embossed along its edge serving as a base of spacing measurement for a pivotally mounted swing ... | 01/09/2007 |
| 7082692 | Adjustable multifunction ruler An adjustable ruler includes two elongate ruler members and an adjustable clamping member. Each of the ruler members includes a longitudinal slot, outwardly facing channels along opposite sides of the slot, parallel longitudinal sides, and measuring indicia marked a... | 08/01/2006 |
| 6941667 | Teaching sin and cosine instrument A device that teaches the relationship between a right triangle, the length of its hypotenuse, the length of its two sides and the trigonometric functions. The device includes a horizontal and vertical ruler attached by a sliding attachment bracket. A circular plate... | 09/13/2005 |
| 6536125 | Measuring and shifting square A device for generating angles has a ruler-shaped basic rail having a first guide extending in a longitudinal direction of the basic rail. A stop rail is arranged in the first guide of the basic rail and is rotatable and slidable into different positions ... | 03/25/2003 |
| 6049990 | Multifunction layout tool A Multifunction Layout Tool capable of performing the functions of an adjustable square, adjustable T-square, try square, combination square, protractor, angle duplicator, depth gauge, rip gauge, rafter-stair layout tool, and compass is disclosed. The too... | 04/18/2000 |
| 5652506 | Apparatus for measuring an a.c. current in a cable An apparatus for measuring an a.c. current flowing in an electric cable comprises a pair of jaws for receiving the cable and which are movable towards one another to engage the opposite sides of the cable. A potentiometer generates a signal ("cable size s... | 07/29/1997 |
| 5208992 | Measuring instrument An improved measuring apparatus (10) including male (12) and female (11) measuring instruments equipped with complimentary pairs of male (14) and female (13) sleeve bodies bearing a multiplicity of variably aligned calibrated indicia (50) representative o... | 05/11/1993 |
| 5205045 | Household tile cutting gauge A tile cutting gauge comprises mainly a semi-circular protractor and a guide rod pivotally fastened to the protractor. A length ruler is slidably mounted on the straight side of the protractor, while a baffle means is slidably mounted to the guide rod in ... | 04/27/1993 |
| 4712308 | Measurement method and apparatus Method and apparatus for interpolating elevation values and related locations from data provided on drawings by using an instrument with a supporting scale bar on which are mounted two slides that each has an extension arm. In use, the slides are set at t... | 12/15/1987 |
| 4562649 | Adjustable carpenter square An adjustable carpenter square for use in determining the relative angles between two predetermined points defined by a pair of longitudinal extensions pivotally attached together at one end.... | 01/07/1986 |
| 4451993 | Sliding rule and protractor An extensible rule and protractor formed by an equally dimensioned pair of superposed strap members, having indicia thereon, secured together by a screw projecting through one member and sidably received by a longitudinal slot in the other member. Guide p... | 06/05/1984 |
| 4327500 | Computational aid device for Ekelund ranging A computational aid device for Ekelund range determinations comprising a e member adapted to be placed over a bearing/time plot and including two leg members to be aligned with intersecting bearing rate lines faired through the plot, and a range scale po... | 05/04/1982 |
| 4282655 | Cardiac axis calculator A device for determining the mean cardiac axis for aiding in the interpretation of an electrocardiograph includes a disc shaped member having a pair of radially extending arms pivotally attached to the center of the disc. The disc also carries a plurality... | 08/11/1981 |
| 4223445 | Carpentry measuring tool A carpentry measuring tool including two arms pivotally connected at adjoining ends thereof. The two arms are angularly adjustable with respect to one another, and are adapted for determining the angle formed between the interior portions of intersecting ... | 09/23/1980 |
| 4133113 | Proportioner device and method of use of same to shim motors The invention comprises a linear proportioning device and method of using same to quickly and accurately calculate the shim thickness necessary to bring the shaft axis of a motor parallel to that of a pump to be driven, and then vertically adjust the axis... | 01/09/1979 |
