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 |
| 3981357 | Marine riser An improved marine riser is described which is comprised of a plurality of conduit sections joined together end to end. Buoyancy cans for retaining a compressed gas are flexibly connected to the riser at selected locations along its length and form a flui... | 09/21/1976 |
| 3971576 | Underwater well completion method and apparatus Extended casing method and apparatus for completing an underwater well whereby complete and continuous pressure control is maintained at the surface drilling platform. A conductor casing is installed in the floor of a body of water with a casing head and ... | 07/27/1976 |
| 3957112 | Offshore apparatus for carrying out operations in an offshore well A marine riser or conductor that extends between a floating drilling vessel and an underwater wellhead is provided with buoyancy means in the form of small-diameter, stiff-walled fluidtight tubes arranged around the outer wall of the marine riser.... | 05/18/1976 |
| 3955621 | Riser assembly A riser assembly in which each of the riser pipe and choke and kill lines includes a telescoping joint in a lower portion thereof which is at least partially pressure balanced so that the upper end of the assembly may be fixed to the drilling vessel.... | 05/11/1976 |
