...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 |
| 6814011 | Plant for the hot treatment of waste gases from municipal waste incinerators Plant for the hot treatment of waste gases from municipal waste incinerators or the like, comprising a first line of taking up hot waste gases for treating in an exit section of a municipal waste incinerator, a one stage or multiple stage fluid bed contained within ... | 11/09/2004 |