Did You Know...
...that power steering was invented by independent inventor Francis W. Davis? As chief engineer in the 1920s of the truck division of the Pierce Arrow Motor Car Company, he saw how hard it was to steer heavy vehicles. So that he would be able to keep the profits from his future invention, Davis left his job, rented a small engineering shop in Waltham, Mass., and developed a hydraulic power steering system that led to power steering.
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| Number | Title | Issue Date |
| 7351062 | Educational devices, systems and methods using optical character recognition Educational devices, educational systems, and methods of teaching and learning reading are provided. The devices, systems, and methods can include an indicium reader, such as an optical character recognition device, for reading indicium from objects. Such objects ca... | 04/01/2008 |
| 7273375 | Teaching aid device and method of teaching A device for instructing mathematics includes a work surface and a plurality of movable elements. Each of the movable elements includes, on a front surface thereof, at least a portion of a visible mathematical symbol (including numeric and nonnumeric symbols) thereo... | 09/25/2007 |
| 6551110 | Visual educational device for teaching literacy An educational device (11) for visually modeling words or numerals. The device including a plurality of inverted U-shaped rods (15) and a plurality of balls (17), each ball (17) being movable between a non display position and a display position. When the... | 04/22/2003 |
| 6491524 | Reading device and methods of using same to teach and learn reading A reading device for teaching or learning reading is composed of: (A) a two-layer structure containing a first layer, an opposite second layer, viewing slots formed in corresponding portions of the first and second layers, and a hollow pocket defined betw... | 12/10/2002 |
| 6171111 | Educational device for illustrating mathematical relationships A device and method for demonstrating number theory is disclosed in which the device comprises a frame consisting of the plurality of spaced parallel rods which are secured at their ends to transverse members. The rods carry slidable members which are arr... | 01/09/2001 |
| 6171110 | Teaching aid for developing a child's intelligence A teaching aid is designed to develop intelligence of the preschoolers and is composed of a base and a plurality of sliding members. The base has a pathway portion which is provided with a plurality of intersecting paths. The sliding members are provided ... | 01/09/2001 |
| 5993217 | Learning apparatus A learning apparatus for use with a computer comprising a set of tactile flash cards, each individual card having a tactilely perceptible pattern embossed on a surface of the card and two electrically connected contacts at a unique set of discrete spaced ... | 11/30/1999 |
| 5913771 | End board for supporting a child's bed having moveable pieces slidably mounted thereon An end board for supporting a child's bed comprises a base section and an upper section extending from and spanning the width of the base section. Connected slots are defined by the upper surface of the end board. At least one child's toy is located in, a... | 06/22/1999 |
| 5149097 | Crossword puzzle aid A word puzzle device in which an unknown word is solved by substituting, for each of the unknown letters, the letters of the alphabet, and combining these letters with the letters known to exist in the unknown word to determine the identity of the word. T... | 09/22/1992 |
| 5018728 | Name forming game apparatus and method A game apparatus 10 for forming initial couplets for use in a game wherein players associate names of individuals with such initial couplets. Apparatus 10 provides for set selection disks 23 in connection with indicator 24 to distinguish sets of individua... | 05/28/1991 |
| 4682955 | Educational toy An educational toy comprises a body having a peripheral vertical wall, a guide plate secured on the body and having a plurality of radial cutouts to be passages, a connecting passage formed between the vertical wall and the guide plate to communicate with... | 07/28/1987 |
