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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 |
| 5615270 | Method and apparatus for dynamic sound optimization This invention comprises a system to compensate for the noise level inside a vehicle by measuring the music level and the noise level in the vehicle through the use of analog to digital conversion and adaptive digital filtering, including a sensing microp... | 03/25/1997 |
| 4672675 | Multiple speaker loudspeaker with conductive bridge A multiple speaker loudspeaker of the type comprising a larger speaker including a larger frame and at least one smaller speaker including a smaller speaker support structure is provided with first and second rigid power conductors which are rigidly mount... | 06/09/1987 |
| 4661874 | Low friction cleaner for magnetic transducer head A cleaning tape for an apparatus of the type which includes a magnetic head and a drive mechanism for the head includes a cleaning member adapted to be moved past the magnetic head during a cleaning operation. The cleaning tape defines an array of raised ... | 04/28/1987 |
| 4586100 | Cleaning disc A cleaning device for cleaning contact-type information transducing heads is disclosed. The device has a substrate covered in part by a cleaning material and partly by a recording surface. A program is stored on the recording surface for directing the tra... | 04/29/1986 |
| 4565905 | Loudspeaker construction A loudspeaker allowing snap-together assembly and extensive use of plastic is provided. The magnet is substantially enclosed between a molded plastic basket and a threaded cap, and the magnet clamps the spider which centers the voice coil in place. The ba... | 01/21/1986 |
| 4561142 | Disc cleaner A disc cleaning device is disclosed which includes a disc support platform mounted to rotate about a first axis. This platform is adapted to support a disc to be cleaned and to center the disc to be cleaned about the first axis. An annular cleaning surfac... | 12/31/1985 |
| 4562595 | Front panel for electronic device such as an automotive radio and method for installing same A front panel assembly for an automotive radio is disclosed which includes a central control panel, a left side control panel, and a right side control panel, each of which includes a respective plurality of control switches. Conductors, such as flexible ... | 12/31/1985 |
| 4550230 | Speaker grille with snap-in fastener system A system for facilitating attachment of a loudspeaker grille to an adjacent structure. The invention includes a fastener with a square head which is shaped to be inserted within a head-receiving portion formed in the grille. The fastener is gripped on one... | 10/29/1985 |
| 4531234 | Optimizing antenna interface for automobile radio receivers An automatic signal optimizing interface for connection between the antenna of an automobile radio receiver and the receiver itself processes the RF signal received by the antenna and provides an improved output signal to the automobile receiver which is ... | 07/23/1985 |
| 4518642 | Loudspeaker diaphragm and method for making same A loudspeaker diaphragm is disclosed which is formed of a slurry of cellulose fibers and polypropylene fibers. In the fabrication of the diaphragm, a felt is made of the slurry, and the felt is subjected to sufficient heat and pressure to fuse the polypro... | 05/21/1985 |
| 4503292 | Cammed latching system for loudspeaker and grille A system for releasably attaching the grille of a loudspeaker directly to the rim of the loudspeaker. The system includes a plurality of latch members in the form of posts extending from the grille, each of the posts having an indentation including a cam ... | 03/05/1985 |
| 4470089 | Tape unit cleaning device A cleaning cassette for a tape unit includes a supply reel and a take-up reel, with a cleaning ribbon mounted therebetween. The cleaning ribbon extends around various support surfaces in the cassette, and passes two cleaning stations. The first cleaning s... | 09/04/1984 |
| 4465905 | Loudspeaker assembly A loudspeaker allowing snap-together assembly and extensive use of plastic is provided. The magnet is substantially enclosed between a molded plastic basket and a first lock member. Deformable fins aid in centering the magnet and in maintaining an annular... | 08/14/1984 |
| 4452480 | Record handling device A record handling device is disclosed which includes a frame which defines a handle and an arcuate record contacting member. This contacting member defines an arcuate groove sized to receive the peripheral edge of a record. A record retaining member is pi... | 06/05/1984 |
| 4435833 | Fade control circuit for auxiliary amplifier A sound reproduction system is disclosed which includes a main amplifier which drives two main speakers via a fader control. An auxiliary speaker powered by an auxiliary amplifier is coupled to the sound reproduction system in such a way that the loudness... | 03/06/1984 |
| 4414438 | Video game controller A video game joystick controller is disclosed which includes a lower housing which defines a lower convex bearing surface, an upper housing which defines an upper concave bearing surface concentric with the lower bearing surface, and a handle which define... | 11/08/1983 |
| 4378582 | Demagnetizing apparatus A demagnetizing device for a cassette tape player includes a cassette shell which defines a generally oval-shaped guide track extending around the interior of the shell. A magnet assembly is provided with shafts which fit within the guide track such that ... | 03/29/1983 |
| 4368866 | Mounting bracket and mounting arrangement A mounting bracket and an arrangement for mounting an electronic accessory device within the mounting bracket when installed in a vehicle not only holds the device for its intended use but also permits limited withdrawal for insured and normal access to t... | 01/18/1983 |
| 4303142 | Combined acoustical transducer and grille An acoustical transducer and grille combined into a single unit. The grille is acoustically transparent and includes a plurality of wave guides separated for through-passage of sound. Situated in the midst of the grille is a mounting for the acoustical tr... | 12/01/1981 |
