...that while attempting to develop a super strong glue, 3M employee Spencer Silver accidentally developed a glue that was so weak it would barely hold two pieces of paper together? However, his colleague Art Fry needed the glue. Fry sang with his church choir and marked the pages of his hymnal with small scraps of paper that often fell out. He used Silver's glue to hold the papers in place. Today we call this invention Post-it Notes.
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| Number | Title | Issue Date |
| 5713159 | Multi part plastic lineal A lineal of plastic material comprises multiple components extruded as a single piece and secured to one another by at least one wall formed in the lineal. One of the components is provided with a recess and another of the components has a leg which, upon... | 02/03/1998 |
| 5191735 | Movable louvre clamp A louvred structure comprises a frame with opposing styles supporting a plurality of moveable louvres having pivot pins fitted in pivot pin openings of the styles. At least one of the styles is provided with an interior flexible clamp extending lengthwise... | 03/09/1993 |
| 5187896 | Pivot rod connector for moveable shutters A louvre control for operating moveable louvres of a window or door structure is connectable to a louvre having an undercut recess for receiving a connector on the control. The connector is normally set in a louvre connecting position, is moveable to a lo... | 02/23/1993 |