Famous Patents
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 |
| 3952420 | Digital solid state compass A timing circuit receives substantially square wave clock signals and generates Sine and Cosine driving signals therefrom at a predetermined frequency for application to first and second mutually perpendicular Hall effect generators. The output signals fr... | 04/27/1976 |
| 3942257 | Index error correction for flux valve heading repeater system A flux valve compass heading repeater system is provided with a compensating system which, when connected to a three-legged flux valve, provides fully compensated, three-wire output signals of the synchro data transmitter type for direct use in apparatus ... | 03/09/1976 |
| 3942258 | Earth reference thin-film magnetometer compass exhibiting total tilt immunity A thin film compass apparatus utilizing a plurality of thin film magnetometers arranged in an orthogornal coordinate system to provide an earth reference compass having total tilt immunity.... | 03/09/1976 |
| 3939572 | Latitude compensator for flux valve heading repeater system A flux valve compass heading repeater system is provided with a compensating system which, when connected to a three-legged flux valve, provides fully compensated, three-wire output signals of the synchro data transmitter type for direct use in apparatus ... | 02/24/1976 |
| 3938257 | Two-cycle compensator for flux valve heading repeater system A flux valve compass heading repeater system is provided with a compensating system which, when connected to a three-legged flux valve, provides fully compensated, three-wire output signals of the synchro data transmitter type for direct use in apparatus ... | 02/17/1976 |
| 3936949 | Static non-swinging course determining device on a vehicle A static non-swinging device for determining the course on board a vehicle comprising a magnetometer having three axes for determining the components of the earth's magnetic field along three axes connected to the vehicle, a vertical gyroscope and a compu... | 02/10/1976 |
