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 |
| 7438213 | Voting ballot envelope A return envelope for a ballot on which the voter's address is printed has a folding flap configured so as to eliminate the possibility that the return envelope with an enclosed ballot will be returned to the voter's address and assures that it will be returned to t... | 10/21/2008 |
