Famous Patents
3M employee and church chorister Art Fry needed something to temporarily mark pages in his hymnal. He was in luck because his colleague, Spencer Silver, accidentally developed a glue that was too weak for other purposes. After initially discouraging consumer response, Post-it Notes became a hit in 1979.
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| Number | Title | Issue Date |
| 4967669 | Track expander device for a conveyorized transport system A track expanding device is employed in a conveyorized transport system to spread apart adjacently disposed sections of track thereby tensioning an endless chain travelling with these track sections. The expanding device comprises a splice and an expander... | 11/06/1990 |
| 4261459 | Continuous grate track length compensator An apparatus is provided for adjusting pallet wheel track length when the spacing between pallets changes due to temperature changes such as in the sintering of ore. The apparatus comprises pivotable arc segments which can be opened or closed to expand an... | 04/14/1981 |
