Famous Patents
3M employee and church chorister Art Fry needed something to temporarily mark pages in his hymnal. He was in luck because his colleague, Spencer Silver, accidentally developed a glue that was too weak for other purposes. After initially discouraging consumer response, Post-it Notes became a hit in 1979.
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| Number | Title | Issue Date |
| 4210329 | Videogame with mechanically disjoint target detector A target videogame employing a screen with a moving light spot symbol and a mechanically disjoint target detector. Signals generated by light received in the target detector and by discharging a trigger attached to the target detector are transmitted by w... | 07/01/1980 |
| 4205847 | Target video game avoiding erroneous counts A target videogame employing a screen with a moving light spot symbol and a target detector. A frequency selective circuit is provided for selecting the electrical signals generated by the light entering a photosensor in the target detector according to t... | 06/03/1980 |
