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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 |
| 6573675 | Method and apparatus for adaptive energy control of hybrid electric vehicle propulsion A series type hybrid electric vehicle and method including a generator set having an internal combustion engine and a generator, a battery array and at least one electric motor includes a controller for controlling propulsion of the vehicle. The controlle... | 06/03/2003 |
| 6483198 | Hybrid electric vehicle having a selective zero emission mode, and method of selectively operating the zero emission mode A series type hybrid electric vehicle that controls an internal combustion engine, generator, and electric motor for zero emissions within a zero emission zone. As the vehicle approaches the zero emission zone, the internal combustion engine and generator... | 11/19/2002 |
| 6333620 | Method and apparatus for adaptively controlling a state of charge of a battery array of a series type hybrid electric vehicle A series type hybrid electric vehicle including a generator set having an internal combustion engine and a generator, a battery array and at least one electric motor includes a controller for maintaining a state of charge of the battery array within a con... | 12/25/2001 |
