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US 4166152

The Sticky Microscopic Beads Behind Post-it Notes

3M's 1977 patent on tiny, naturally sticky plastic beads that can stick to a surface, peel off easily without leaving residue, and be reused over and over again.

Statusexpired

Granted1979

Expires1997

Claims13

Forward citations278

Prior art2

AssigneeMinnesota Mining and Manufacturing Co

InventorsWilliam A. Baker, Warren D. Ketola

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