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| Number | Title | Issue Date |
| 4833697 | Writing instrument for electronic counting and gravity switch reset A ballpoint pen of conventional size and shape has a movable ball point that is pressed upwardly in the direction of the housing of the pen when a mark is made. Means is provided for normally biasing the ballpoint outwardly of the housing. However, when t... | 05/23/1989 |
| 4726044 | Writing instrument with solar-powered electronic counting and liquid cyrstal display A ballpoint pen of conventional size and shape has a movable ball point that is pressed upwardly in the direction of the housing of the pen when a mark is made. Means is provided for normally biasing the ballpoint outwardly of the housing. However, when t... | 02/16/1988 |
