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 |
| 3947919 | Plant for the recovery of slaughtered animal blood The invention provides a plant for recovering blood from slaughter animals including at least one stabbing knife with a corresponding vacuum tube and a metering apparatus connected to the stabbing knife, said metering apparatus comprising a pneumatic mete... | 04/06/1976 |
