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 |
| 4245910 | Apparatus for detecting particles suspended in a gas The invention relates to a dust indicator for detecting the presence of suspended particles, either solid or liquid, in a gas. A concentrated, substantially parallel light beam (1) of suitable wavelength is directed through a measuring chamber (2) contain... | 01/20/1981 |
| 4112162 | Structural chipboard wood beam A chipboard beam made of glue coated chips has top and bottom layers extending for the full length of the beam consisting of elongated chips, that may be for example as much as 5cm in length oriented with their fibers in the longitudinal direction of the ... | 09/05/1978 |
| 4106511 | Electrical stimulator in remedy of incontinence An electrical stimulator is provided for controlling the urethral -- the bladder and/or the rectal function. Said stimulator comprises an obturator to be worn within the vagina or anus. The obturator is made of a flexible material, which can be expanded f... | 08/15/1978 |