The first match was accidentally discovered in 1826 when John Walker scraped a stick with chemicals on the end against a stone floor.
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| Number | Title | Issue Date |
| 7369910 | Method for the optimizing of a production process The present invention relates to methods for optimizing a production process having starting products, intermediate products and at least one final product. The present invention also relates to a digital storage medium and a computer program product that can be use... | 05/06/2008 |
| 7303074 | Foldable organizer device A foldable device for carrying and displaying at least one flat article is disclosed, including a foldable unitary member adapted for movement between an open and a closed position. The unitary member includes an inside surface, an outside surface, and top, bottom, ... | 12/04/2007 |
| 6997481 | Checkbook cover A checkbook cover has an exterior cover, an interior check and register holder affixed adjacent to the cover, and a slot formed through the exterior cover. A writing instrument, preferably with a pocket clip thereon, passes partially through the exterior cover slot ... | 02/14/2006 |
| 6585520 | Method and system for enhancing memorization by using a mnemonic display A method and system is disclosed for enhancing a memorization process by using a mnemonic display implemented with a grid learning system. First, the grid learning system is implemented on a predetermined display area of a display device with a plurality ... | 07/01/2003 |
| 6345821 | Household chore designation game A game for designating chores is provided comprising a board structure having a front face from which markings can be erased. Defined areas of the face are divided into at least a chore region and a name region. Numbered chores are listed in the chore reg... | 02/12/2002 |
| 6173153 | Method and apparatus for taking school attendance An apparatus for taking school attendance includes a central office computer 101 interfaced with a plurality of attendance telephones 102. Typically, the interface is based on telephone lines or similar hard-wired network. Each AT device may therefore com... | 01/09/2001 |
| 5429373 | Play money to be earned and spent by children Play money to be earned and spent by children comprising a plurality of sheets of bills of money of various numerical denominations, the money having printed thereon the denominations, a happy child face and "money" printed thereon, such money adapted to ... | 07/04/1995 |
| 5421729 | Color-coded catalog and sales method A color-coded system of training illiterate, mentally handicapped or dyslexic individuals in the accurate ordering process which includes specifying colors designating particular items and the item bearing a particular color. Color-coded visual indicators... | 06/06/1995 |
| 5230627 | Educational checkbook An instructional, developmental and educational product and method for children comprises a book of imitation checks, a checkbook ledger, and a wallet for enclosing the checkbook and checkbook ledger. The wallet constitutes a rectangular flexible base she... | 07/27/1993 |
| 5056792 | Business education model A business education model in which players may simulate the running of a company with the amounts and types of assets, liabilities and future commitments, contingent liabilities, of a company or other business enterprise being shown through the number, c... | 10/15/1991 |
| 4909740 | G. P. A. challenge game, and methods of constructing and utilizing same A G.P.A. challenge game encouraging a student to raise his/her overall grade point average and a method for playing the game. The game comprises a course document sheet, a graphic progress chart, a weekly/monthly planner sheet, and privilege and bonus pri... | 03/20/1990 |
| 4773862 | Method for mapping a joint venture and maps produced thereby A method and map (10) for charting historical events by ventures A and B in a joint venture is described. The method and map enable a visual understanding of the operation of joint venture in the past and possibly more effective development of the joint v... | 09/27/1988 |
| 4689018 | Method of monitoring credit card charges A method for monitoring an individual credit card account particularly during a predetermined monitoring period. The steps of the method include the steps of setting up a form, preferably on a piece of erasable material of wallet card size. A series of nu... | 08/25/1987 |
| 4674192 | Accounting guide A guide for use by bookkeepers, accountants, auditors and the like in association with ledger sheets, journals, spread sheets and the like having informational indicia associated in horizontal rows and vertical columns to enable such information to be mor... | 06/23/1987 |
| 4336019 | Educational accounting game An accounting game comprising a rectangular gameboard having two sets of blank columns printed thereon and a sheet of separable game pieces each having an accounting type legend thereon or a numerical legend. The front surface of the gameboard and the rea... | 06/22/1982 |
| 4142305 | Teaching aid for accounting A teaching aid for accounting comprising a flat rectangular bookkeeping entry guide bearing accounting indicia. A plurality of chips are provided, shaped to fit into recesses in the entry guide. A plurality of account cards are also provided, along with l... | 03/06/1979 |
| 4043055 | Teaching aid for accounting A teaching device useful as an aid in teaching the rudimentary principles of accounting comprising at least one triangular journal device bearing accounting indicia thereon and means on said triangular device for recording and displaying accounting data. ... | 08/23/1977 |
| 4008527 | Educational accounting device A plurality of transaction cards adapted for use with an educational accounting device are disclosed. Each card bears accounting indicia on its upper and lower portions. A pair of numeral-bearing disks are mounted adjacent to the upper and lower portions ... | 02/22/1977 |