Did You Know...
...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 |
| 7254899 | Arch measuring device A measuring device for measuring the arc of an arched window comprising a base; measuring means selectively rotatable relative said base for measuring a distance between said base and said arch at a selected angle. ... | 08/14/2007 |
