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...that after Walter Hunt patented the safety pin in 1849, he sold the rights to it for $400?
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| Number | Title | Issue Date |
| 7324859 | Substrate for use with audio file player A substrate includes at least one visual representation of an audio file and encoded data associated with the at least one audio file. The encoded data can be sensed by a selection device to cause an audio file stored in a computer system to be provided to the selec... | 01/29/2008 |
| 7286887 | Audio player with sensing device An audio player (10) is provided with an image sensor (16) capable of imaging invisible infrared tags (78) on a substrate (70). The tags (78) encode identity data which is directly or indirectly associated in a computer system with... | 10/23/2007 |
| 7192628 | Magnetically interactive substrates A substrate is printed with areas of magnetizable ink. The magnetizable ink is compressed into the surface of the substrate, and overprinted to hide it. Suitable inks for the purpose are disclosed. The ink may be permanently magnetized in any of a variety of pattern... | 03/20/2007 |
| 7055823 | Cards The present invention relates to educational and entertaining playing cards. The cards may be used alone or in combination with other hardware game accessories, such as board games, or software game accessories, such as compact discs and the Internet. Unlike other p... | 06/06/2006 |
| 6053741 | Flash card holder and learning method A learning device comprises a receptacle for holding an information bearing card. The information bearing cards include a problem and a coded answer. The receptacle of the learning device includes a decoding display window with a movable writing screen wh... | 04/25/2000 |
| 5701696 | Card holder A card holder having a pair of plates movably coupled together by a series a straps for displaying and playing with cards. The plates include openings into which the cards are received. The straps overlie one face of each of the plates so as to cover sele... | 12/30/1997 |
| 5618180 | Method of teaching using a computer A method of using a computer to teach, wherein a child first studies a first element of information located on a computer screen, then locates an empty space adjacent to first element. The empty space is intended to receive a second related element of inf... | 04/08/1997 |
| 5447439 | Interactive story book using stickers and a method of teaching A story book assembly and a method of teaching wherein a child first studies a first element of information, then locates an empty space adjacent to first element. The empty space is intended to receive a second related element of information. After compa... | 09/05/1995 |
| 5314197 | Game apparatus Game apparatus in which a pawl and ratchet mechanism indexes a game card to bring successive game indicia to a viewing opening, said indicia comprising intelligible indicia interspersed with unintelligible indicia, said intelligible indicia being intellig... | 05/24/1994 |
| 5295695 | Method of coding gifts A method of coding gifts including a set of stickers all with one symbol which are attached to gifts with a card given to the child identifying the symbol and indicating that all gifts with that symbol belong to that child. Clue cards are used to allow th... | 03/22/1994 |
| 5190298 | Amusement devices Memory-oriented or pattern matching games use game pieces having indicia which become excited responsive to a brief exposure to strong light or another activating event for emitting colored light during a short period of time. The games use the excitable ... | 03/02/1993 |
| 4891011 | System for assisting the learning of a subject A system for assisting the learning of a subject and, more specifically, for the aiding of the teaching of a language. The system comprises a substrate upon which is arranged a first, basic text that contains supplementable information which is unaidedly ... | 01/02/1990 |
| 4731023 | Teaching system using prerecorded tape A teaching system utilizing prerecorded tape which is prepared in sectors with a message segment and position indicators in the form of transparent windows which are photoelectrically detected. After a message or question is played, a first window is dete... | 03/15/1988 |
| 4674433 | Correct answer displaying device for arithmetic practicing unit A correct answer displaying device for an arithmetic practicing device or the like. Plural chambers are arranged in matrix form with partition boards, and a colored transparent plate is placed over the chambers on which numerical problems to be solved are... | 06/23/1987 |
| 4615682 | Teaching system utilizing magnetic tape A teaching system utilizing magnetic tape which is prepared in sectors with a message segment and position indicators in the form of transparent windows which are photoelectrically detected. After a message or question is played, a first window is detecte... | 10/07/1986 |
| 4604065 | Teaching or amusement apparatus Teaching or amusement apparatus consists of a substrate bearing printed intelligence and a detector pen or unit for use therewith. The detector pen discriminates between areas on the printed substrate by means not visible to the naked eye e.g. by a differ... | 08/05/1986 |
| 4521074 | Binocular presentation of visual information Pairs of images are presented to an observer under conditions such that they are perceived as a single image and provide information about their mutual relationship. The pair are derived from non-equivalent image means, e.g. from (a) a photograph of a sce... | 06/04/1985 |
| 4286385 | Color screen indicator A composite indicator for use with overlay process color screen tints in offset color printing comprised of a composite screen made of relatively angled color screens. The respective dot patterns of the color screens have the word of the process color ass... | 09/01/1981 |
