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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 |
| 5201860 | Air purification planter An air purification planter is disclosed which comprises a receptacle; an aeration assembly; a pot-growing plant; and, a potting media. The receptacle is of the type utilized commercially. A portion of said aeration assembly is sized and proportioned to f... | 04/13/1993 |
| 5192486 | Plant and process for fluidized bed reduction of ore An improved FIOR processing plant and method for reducing raw iron ore fines into a 90+% metallized briquette product utilizing a multi-stage fluidized bed reactor in which the reducing and fluidizing gases are the products of partial combustion of methan... | 03/09/1993 |
| 5185032 | Process for fluidized bed direct steelmaking A fluidized bed direct process for reducing raw iron ore fines and directly producing an iron product comprises a process for feeding raw iron ore fines into a multi-stage reactor assembly; a process for reducing fines in fluidized beds developed by a cou... | 02/09/1993 |
| 5082251 | Plant and process for fluidized bed reduction of ore An improved FIOR processing plant and method for reducing raw iron ore fines into a 90+% metallized briquette product utilizing a multi-stage fluidized bed reactor in which the reducing and fluidizing gases are the products of partial combustion of methan... | 01/21/1992 |
| 4903004 | All-weather digital distance measuring and signalling system An all-weather digital distance measuring and signalling system for a vehicle specifically intended for accurately measuring distances of obstructions, such as behind a truck as it is being backed up. An array of transducer devices having independent send... | 02/20/1990 |
| 4884627 | Omni-directional heat pipe An omni-directional heat pipe for cooling a local heat area, such as in electronic circuitry, including a sealed cavity for containment of multiple capillary-like coolant paths which may be inter-connectable or otherwise disposed in order to facilitate wi... | 12/05/1989 |
| 4858444 | Portable cooler An improved portable cooler for carrying and cooling a 15-pak of beverages including a sealable cavity for pyramid-stacked containment of 12 or 16 oz. canned beverages, a plastic insert for retaining the lower layers of cans in side-by-side relation and s... | 08/22/1989 |
