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 |
| 5476526 | Adjustable filter frame and grid This invention is directed to a user-sizable filter grid and an adjustable interlocking filter frame and grid system suitable for use in heating and cooling systems. The user-sizable grid is adapted to interlock with an adjustable frame, thereby holding a... | 12/19/1995 |
| 5451929 | Smoke alarm and air cleaning device An air cleaner with a smoke alarm unit for a forced air recirculating system is disclosed. The smoke alarm unit is housed within a module that fits within the frame of the air cleaner with minimal impact on the cleaning ability of the cleaner. In a prefer... | 09/19/1995 |
| 5182542 | Smoke alarm and air cleaning device An air cleaner with a smoke alarm unit for a forced air recirculating system is disclosed. The smoke alarm unit is housed within a module that fits within the frame of the air cleaner with minimal impact on the cleaning ability of the cleaner. In a prefer... | 01/26/1993 |
