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| Number | Title | Issue Date |
| 7415772 | Rainbow ruler A set of rulers for teaching the concept of measurements includes a first ruler having a first group of incremental division lines corresponding to a first group of measured lengths, each line of the first group having a first length and a first color. A second rule... | 08/26/2008 |
| 6813841 | Measuring device for teaching incremental measurements The present invention provides a measuring device for teaching incremental measurements to a user of the measuring device. The measuring device comprises a fastener and a plurality of rulers containing graduated markings and rotatably attached to the fastener. Each ... | 11/09/2004 |
| 6816805 | Computer generated scale and conversion instrument The present invention relates to a process and method for printing, utilizing a computer and computer printer, a scale instrument and conversion tool to be used in preparing and interpreting scaled drawings, maps, aerial photographs, graphs and similar documents. Th... | 11/09/2004 |
| 6243959 | Measuring and instructional ruler A measuring and instructional device containing a base panel having a top surface and perimeter bounded by at least one edge, with the top surface having evenly spaced apart linear rulings perpendicularly disposed to the edge and defining a non-linear sta... | 06/12/2001 |
| 5881469 | Measuring and instructional ruler A measuring and instructional ruler device is provided for use by children and persons during the instruction of linear measurement, and for use in the measuring and drawing of objects. The device is comprised of a base panel having a top surface having s... | 03/16/1999 |
| 5822875 | Scanning electron microscopic ruler and method A set of ruled devices and method for measuring an actual dimension of a specimen displayed as a magnified image by a magnification system such as a scanning electron microscope having a plurality of selected magnification factors. The magnified image inc... | 10/20/1998 |
| 5479719 | Rolling ruler The present rolling ruler includes a ruler body having a through hole, a shall having two ends and sleeving thereon the ruler body, and two rollers respectively mounted on the two ends for translating the ruler body. One characteristic of present inventio... | 01/02/1996 |
| 4839833 | Programmable display engineering scale A programmable display engineering scale instrument includes a scale base such as a drafting machine type scale, an electronic display device including a plurality of rows of column aligned display elements, scale selection switches, and circuitry interpr... | 06/13/1989 |
| 4707928 | Vari-scale This invention relates to a graduated engineer/architect rule having variably selectable scales for measuring distances and establishing linear proportionalities for representation on a technical drawing. The rule comprises an enclosed, continuous fabric ... | 11/24/1987 |
