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 |
| 4039825 | Position indicating system The invention concerns apparatus for indicating the position of a light beam relative to a target, comprising an optical system, as many linear arrays of photoelectric elements as the number of coordinates in which the position indication is sought, and a... | 08/02/1977 |
