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| Number | Title | Issue Date |
| 7284881 | LED fixing device of a pixel module and method for manufacturing the same An LED fixing device of a pixel module for a sign board is provided. The LED fixing device is installed on a front side of an LED panel of a road sign board, facilitates the downward flow of rainwater, and prevents the rainwater from being introduced into a pixel mo... | 10/23/2007 |
| 4868374 | Self-contained detector device for checking information recorded on a carrier A self-contained detector device for educational or amusement purposes cooperates with conducting and non-conducting zones of a carrier. The detector is in the form of an elongated hollow body with a reading or detecting head projecting from one end. The ... | 09/19/1989 |
| 4557694 | Teaching device and method of using same A small console containing a keypad such as an elastomeric array keypad and a microprocessor which is preprogrammed with a number of simple algorithms. The individual keys (switches) are preferably, although not necessarily, hidden to the user and are arr... | 12/10/1985 |
| 4323243 | Electrical board game device An electrical board game device is described in which a plurality of slidable elements are mounted on a housing for relative sliding movement with respect to each of the other elements on the housing. Each element has a uniquely arranged pattern of electr... | 04/06/1982 |
| 4306870 | Contact-actuated light pencil A contact-actuated light pencil for use in detecting electrically conducting areas or materials. The light pencil includes a hollow pencil body having an aperture at one end, a tubular electrical contact at the one end which lines the aperture, and a cond... | 12/22/1981 |
| 4194302 | Answer-spotting electric instrument An answer-spotting electric instrument which is provided with a counter so as to totalize the number of correct answers. The answer-spotting electric instrument having the counter is of the type which is provided with a pair of adjoining terminal members,... | 03/25/1980 |
| 4183152 | Electrical indicating device An electrical indicating device having an animal appearance with indicator lights, incorporated as a part of the features of the animal, to be energized to indicate selection of a right answer from among a number of possible answers. A casing is formed of... | 01/15/1980 |
| 4115931 | Individualized teaching system utilizing electrical continuity An improvement in the system for educational and entertainment purposes in which the user is afforded an opportunity to select a correct answer for a question from among a plurality of possible answers is disclosed. The improvement includes a composite la... | 09/26/1978 |
