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 |
| 4247271 | Continuous vulcanizer for producing elongated member A horizontal type vulcanizer for continuous production of an elongated member made of a natural or synthetic polymer. The elongated member passes through a pressurized liquid heat medium to achieve vulcanization. Leakage from the liquid bath seal is preve... | 01/27/1981 |
