Felix Hoffmann, a German chemist, was searching for something to relieve his father's arthritis. In doing so, he "rediscovered" acetylsalicylic acid and in 1900, patented a stable process for developing it. Hence, we have aspirin.
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| Number | Title | Issue Date |
| 6397596 | Self contained generation system using waste heat as an energy source An electrical generation system that fully integrates heat utilization during the process. The system has two inputs: intake air and diesel fuel. Its outputs are some exhaust gas (carbon dioxide and nitrogen compounds), electricity, and extracted sulfur c... | 06/04/2002 |