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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 |
| 5105519 | Tension control method for nutrunner A tension contol method for a nutrunner performed by the use of a nutrunner and a controller associated with each other. In accordance with the present invention, the fastening torque Tf of the torque transducer of the nutrunner at an intermedi... | 04/21/1992 |
| 4894767 | Method for yield tightening of screws A method for yield tightening of screws by use of a wrench including a device for detecting a tightening torque in the actual tightening process, a device for detecting a tightening angle and an electric motor for applying a torque to each screw, a device... | 01/16/1990 |
| 4587839 | Top dead center measurement for reciprocating crank mechanism A method or system for measuring the top dead center for a reciprocating crank mechanism, in which a reversible counter performs the additive counting operation from an amount H of shift of the piston of the reciprocating crank mechanism to another amount... | 05/13/1986 |
| 4510424 | Nut runner control circuit A nut runner control circuit which permits tightening of a screw in the plastic region with a normal torque without necessity of detecting the critical point from the elastic region to the plastic region. The ratio T0 /θ2 of an incr... | 04/09/1985 |
