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 |
| 7350306 | Easy stairs Easy Stairs is an L-shaped device having a diagonal sliding rod attached to the two sides. Connectors with locking devices allow the diagonal rod to firmly affix to the sides at various locations. To use Easy Stairs, a user adjusts the diagonal rod along the edge of... | 04/01/2008 |
| 7197833 | Framing square jig A tool for holding a framing square has a body with a pair of spaced longitudinal slots accommodating the flat legs of the framing square. Clamping devices mounted on the body clamp the body on the legs of the framing square to fix the position of the framing square... | 04/03/2007 |
| 7114264 | Length adjustable rafter square A rafter square is provided with a triangular base plate, having a flanged base edge portion, a side edge portion, and a hypotenuse edge portion. An extension arm is selectively movable from a retracted position, closely adjacent the hypotenuse edge, to an extended ... | 10/03/2006 |
| 6954990 | Angle measuring device A measuring device is provided for carpenters, roofers and other tradesmen. The device is made of relatively lightweight plastic and has a variety of uses. The elongated base is rectangular in cross sectional and includes a scale for measuring distances along one si... | 10/18/2005 |
| 6920735 | Block positioning tool A block positioning tool includes a first elongated member and a second elongated member attached together such that a L-shaped frame is formed. The frame has an upper surface and a bottom surface. The first and second elongated members each have a slot therein exte... | 07/26/2005 |
| 6918189 | Combination layout tool A combination layout tool especially for use in larger building projects that can be used repeatedly to accurately produce different angles and cuts or layouts. The tool is provided with incremental angle slots in radial alignment with a notch in one side edge for p... | 07/19/2005 |
| 4697351 | Adjustable layout square An adjustable square assembly has a framing square with orthogonal limbs, slide fittings for mounting on the respective limbs with an adjustable angle blade therebetween and a tri-square blade and body for adjustable mounting on one of the limbs so that t... | 10/06/1987 |
| 3934350 | Photo cropping device An improved geometrical instrument for laying out and proportioning photographs and the like including a pair of angle members disposed in overlapping relationship, a diagonal strut connecting said angle members together for limited movement and means sec... | 01/27/1976 |
