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 |
| 4483302 | Combustion engine comprising a vaporizer pressure regulator A combustion engine includes an inlet duct including a control valve. A vaporizer-pressure regulator for use with the combustion engine has a first space divided into two parts by a diaphragm contained in the space, the diaphragm actuating a first shut-of... | 11/20/1984 |
| 4433664 | Fuel system for an internal combustion engine A fuel system of the gaseous type utilizing the gas such as propane, methane or the like, wherein gas, preferably in liquefied form, in a tank carried in the trunk compartment of a car, for example, is taken from the tank in gaseous form and conveyed to t... | 02/28/1984 |
| 4068639 | Automobile engine economizer This device consists primarily of a liquid propane tank with vapor outlet, a vapor storage tank with regulator means, and valve and solenoid means for properly blending propane vapor as the secondary fuel with gasoline as the primary fuel, so as to substa... | 01/17/1978 |
| 4000726 | Safety tank system A gasoline safety tank system utilizing at least one safety tank, each safety tank comprising a tank body with interchangeable inlet and outlet fittings secured to the tank body. A conduit is connected to the inlet fitting and extending into the tank body... | 01/04/1977 |
