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 |
| 4338993 | Underwater outboard marine heat exchanger A first water header is connected to a second water header by laterally-spaced multiple parallel composite tubes, each consisting of two or more component tubes of vertically-elongated rectangular cross-section welded to one another along their horizontal... | 07/13/1982 |
