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...that after Walter Hunt patented the safety pin in 1849, he sold the rights to it for $400?
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| Number | Title | Issue Date |
| 7267473 | Transfer system for coloring agents A system for transferring coloring agents for concrete to a ready mix truck or the like, includes a tank for receiving coloring agents. The tank includes lines for supplying it with water and a pump for transferring the coloring agents to the ready mix truck through... | 09/11/2007 |
| 7140441 | Fluid separation method and system A method and a system for separating the phases of a multiphase fluid from one or more wells. The system includes at least one first gravity separator and at least one second gravity separator, and elements for conducting the fluid from the well or wells to the firs... | 11/28/2006 |
| 5614086 | Method and apparatus for removing contaminants from a water supply A bubble aeration system and method for removing radon and other contaminants from domestic or commercial water supplies in a single tank having a baffle arrangement or channels creating a sinuous water path for a more effective separation of radon from t... | 03/25/1997 |
| 4411673 | Method and apparatus for degassing liquids A degasser system having a central container and degasser tubes extending to the central container. A vacuum is maintained within the tubes and the container by means of a vacuum pump while liquid is extracted from the central container by a pump. A gas c... | 10/25/1983 |
| 4350503 | Fluid flow metering device There is disclosed a fluid flow metering device for use, for example, in a system for preparing a carbonated beverage wherein deaerated water and a beverage concentrate are mixed together in closely controlled proportions. The system can also include a ve... | 09/21/1982 |
