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 |
| 4704200 | Method of separating oil or bitumen from surfaces covered with same The separation of oil or bitumen from a surface of a substrate covered with same is effected by first dissolving the oil or bitumen in a solvent to form a solution thereof. A liquid which does not dissolve the oil or bitumen, is non-miscible with the solv... | 11/03/1987 |
