Did You Know...
...that Thomas Edison's patent application on his phonograph was approved by the Patent Office in just seven weeks? In contrast, it took Gordon Gould, the inventor of the laser, 30 years to obtain his patent -- finally awarded in 1988!
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| Number | Title | Issue Date |
| 7373691 | Eraser dispenser An eraser dispenser is provided which can store in a dispenser body an eraser longer than the overall length of the dispenser body. The eraser dispenser enables the eraser to be used without replacement with a new one for a long period of time. The eraser dispenser ... | 05/20/2008 |
| 4979254 | Eraser feeder An eraser mover for use with a power eraser comprising mechanical means for sliding the eraser out of its holder by inserting prongs into the eraser and moving the prongs outwardly.... | 12/25/1990 |
| 4352580 | Knock-out type mechanical pencil with retractable eraser A knock-out type mechanical pencil has a supporting rod mounted with an eraser at its rear end and axially slidably engaged within the interior of a cylindrical knock-button. A tubularly cylindrical weight is axially slidably engaged around the supporting... | 10/05/1982 |
| 4028771 | Thin flat eraser and holder An eraser device comprising a thin flat rubberlike erasing material and a stiff plastic holder structure therefor, the latter having a trough shape holder bottom locking together by snap clips with an inverted trough shape front cover and an inverted trou... | 06/14/1977 |
