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 |
| 4984589 | Wrapper for smoking article A cellulose wrapper for a smoking article includes a cover layer and at least one inner layer. The cover layer has an area weight of 20 to 60 g/m2, a raw density of 0.5 to 0.9 g/cm3, an air permeability of 10 to 250 CU, a filler mate... | 01/15/1991 |
