...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 |
| 4226177 | Portable grilling device A portable grill device of the type including a first bowl and a second bowl hingedly connected together. The bowls are movable between a closure position where the bowls overlie one another, a generally right angular use position where the second bowl is... | 10/07/1980 |
| 4208959 | Grill device An improved grill device having, in one preferred form, two coal boxes, each coal box being swingable on a horizontal axis between a generally horizontal position and a generally vertical position, the axes being parallel one to another. Novel box support... | 06/24/1980 |