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 |
| 7065826 | Cyclonic bagless vacuum cleaner with slotted baffle A dirt separation and collection container suitable for use in a bagless vacuum cleaner including two dirt separation and collection zones is provided. Dirty air enters the mid-section of the device and enters a first stage dirt separation zone including a cylindric... | 06/27/2006 |