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 |
| 7278379 | Heat exchange system An improved shell-and-tube steam instantaneous heat exchange system of a closely coupled feedback design which overheats water in the heat exchanger portion of the system and then blends the water, as needed, with proportional amounts of cold water to achieve the co... | 10/09/2007 |
| 6006998 | Apparatus for heating a building using a heat pipe An apparatus, based on a heat pipe, is provided for heating a building having at least one enclosed space that is bounded by a wall. The apparatus includes a plurality of passive heat transfer modules distributed along a dimension of the building and a ho... | 12/28/1999 |
| 5544645 | Combination water heating and space heating apparatus A combination water heating and space heating apparatus includes a water heating unit and a space heating unit releasably coupled with the water heating unit. The water heating unit has a water storage tank and a helically wound tubular heat exchanger ins... | 08/13/1996 |
