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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 |
| 7165504 | Antenna linear extension and retraction apparatus for a submersible device, and method of use An antenna linear extension and retraction apparatus and method of use for a submersible device is provided. The apparatus includes a body having a cavity formed at an external surface. A bladder containing a core material is arranged within the cavity. The core mat... | 01/23/2007 |
| 6755147 | Underwater signalling devices A signalling device (10) adapted to make a percussive sound, for example, under water. The signalling device (10) may be attached to a pressurized fluid source, such as a diver's compressed air supply, the device (10) including: a housing (12... | 06/29/2004 |
| 6155196 | Multi-depth acoustic signal generating device A simple mechanical device is provided which generates acoustic signals at ne or more specified depths. The device consists of a spring loaded piston placed in a wall of a housing, the spring loading biasing the piston away from the housing. The piston is ... | 12/05/2000 |
| 6142094 | Depth sensitive mechanical acoustic signal generating device A simple, mechanical device is provided which produces an acoustic signal a specified depth. The device consists of a shear plug in an exterior wall of the device housing which prevents the movement of a spring biased piston. The plug is subjected to inc... | 11/07/2000 |
| 5951205 | Amphibious audible alarm device An amphibious audible alarm device for a diver to use with an air tank in the water or above water surface in the event of incident or emergency to get other people's attention. The device includes a valve member connecting with the air tank for controlli... | 09/14/1999 |
| 5450810 | Underwater communication device and methods An underwater communication device that is simple in design, is simple to operate, is powered solely by a user's wrist action, has only one moving part, is maintenance free, can offer multiple modes of operation, can be made resistant to accidental sound ... | 09/19/1995 |
| 5353263 | Soft sonar suspension system An underwater transducer assembly (T or P) is mounted on an elongated cylindrical piston (32 or 90) received in a pneumatic cylinder (31 or 91). One or more springs (41 or 92) normally bias the piston (32 or 90) inward into the cylinder (31 or 91) to retr... | 10/04/1994 |
| 5106236 | Audible alarm device for divers and others An alarm apparatus, for use with conventional diving equipment or other self-contained breathing apparatus, having a body portion (34) and a noisemaker portion (32). The body portion (34) includes a first opening (42) therethrough communicating with a con... | 04/21/1992 |
| 5022790 | Audible signalling system for divers An audible signalling system is provided for us by divers or the like to provide a relatively loud audible signal which can be used to indicate diver position, to signal distress, etc. The preferred system utilizes an air horn carried by the diver and ada... | 06/11/1991 |
| 4961181 | Acoustic transient generator An underwater transient sound generator for broadcasting optimum acoustical onic energy in sea water with an appropriate intensity and frequency spectrum to achieve passivation of acoustical mines. A high pressure bubble is released from a chamber while a ... | 10/02/1990 |
| 4947783 | Pressure compensation method and apparatus for underwater equipment A method and apparatus for pressure compensating an underwater housing by blowing up a balloon and sealing the balloon mouth around a conduit to pneumatically connect the balloon to the interior of the housing. The balloon is configured to change its appe... | 08/14/1990 |
| 4207626 | Acoustic decoy and jammer 1. In an expendable acoustic apparatus adapted to operate underwater as a coy and having an electrically driven noisemaker operative to generate sound waves of large amplitude over a broad band of frequencies, said noisemaker comprising a driving electric... | 06/10/1980 |
| 4202047 | Acoustic jammer and torpedo decoy 1. An acoustic decoy adapted to operate underwater, said decoy comprising a otor means, a circular spindle means connected to said motor means and adapted to be rotated thereby, said spindle means having a pair of axially aligned spaced parallel discs, a p... | 05/06/1980 |
| 4183008 | Noise making device 4. An underwater noise generator comprising a thick-walled hollow cylindrl housing, said housing having continuous inner and outer cylindrical surfaces and at least one hollow portion between said inner and outer surfaces; a spindle rotatably mounted wit... | 01/08/1980 |
| 4047592 | Self-driven underwater noisemaking device An underwater noisemaking device that is self-driven for use in towed undater acoustic minesweeping or as a decoy countermeasure device. It comprises a cambered and slotted disc mounted in a frame so as to be free to rotate about a horizontal, transverse... | 09/13/1977 |
| 4047148 | Piston type underwater sound generator 1. An apparatus for producing low frequency compressional waves under water hich comprises two circular plates spaced in opposed parallel relation, a plurality of reciprocating fluid motors arranged in parallel between said plates, an independent fluid pum... | 09/06/1977 |
| 4007805 | Cavity producing underwater sound source 1. An acoustical source for minesweeping operations comprising a stator ing outer and inner surfaces which are surfaces of revolution and an open port connecting said outer and inner surfaces, an external rotor adapted to be rotated around said outer sur... | 02/15/1977 |
