Did You Know...
...that several people are credited with the invention of the flush toilet? Most people have heard of Thomas Crapper (1837-1910), the sanitary engineer who invented the valve-and-siphon arrangement that made the modern toilet possible. Another claimant to "the throne" was British inventor Alexander Cumming who patented a toilet in 1775. Then there's a nameless Minoan (a native of ancient Crete) who lived 4,000 years ago who supposedly was ahead of his time and created the first flush toilet!
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| Number | Title | Issue Date |
| 7305886 | Noise detecting apparatus An accurate measure of normally operating noise is required for a useful noise measurement system. A device is needed to make a representative measure of the boat's acoustic power using measured boat sound level with integrated corrections for sensed distance to the... | 12/11/2007 |
| 5363341 | Level measuring device which can be assembled from components The invention discloses a level measuring device which can be made up from components. It comprises a sonic or ultrasonic transducer which is arranged in a first housing and forms a self-contained functional unit; the electrical circuit arranged in a furt... | 11/08/1994 |
| 4945520 | Hydro-acoustic device for warning sea mammals A passive hydro-acoustic device for warning sea mammals away from shallow areas consisting of an anchor linearly arranged in front of a shallow area and a plurality of cables attached to the anchor at predefined intervals and extending substantially perpe... | 07/31/1990 |
| 4943119 | Height control device and method for a fixture for machining an object essentially defined by a single plane A height control device for a fixture which comprises at least a pair of gauging devices each having an ultrasonic transceiver for gauging a certain distance. A signal generator is connected to both gauging devices for generating a signal representative o... | 07/24/1990 |
| 4939703 | Transducer baffle and sensor using same A baffle for enlarging the field of view of and enhancing collection of radiation for a sensor apparatus having a transducer for receiving radiation within its field of view. The baffle includes a base securable proximate the transducer, and at least one ... | 07/03/1990 |
| 4796726 | Ultrasonic rangefinder An ultrasonic rangefinder capable of detecting a distance between a vehicle and an object with high accuracy is shown. The measure of microphones for transmitting and receiving ultrasonic waves is chosen so that detour waves are restricted.... | 01/10/1989 |
| 4750584 | Distance measuring device A distance detecting device having a transmitter for intermittently transmitting measuring waves toward an object, a pair of receivers provided so as to be spaced from each other by half the wave length of the waves in a direction of the object, each rece... | 06/14/1988 |
| 4739860 | Ultrasonic rangefinder An ultrasonic rangefinder capable of detecting a distance between a vehicle and an object with high accuracy is shown. The measurements for microphones for transmitting and receiving ultrasonic waves are chosen so that detour waves are restricted.... | 04/26/1988 |
| 4635240 | Sonar navigation system A forward look sonar system in which speed and direction of a sonar platform is obtained. Each acoustic transmission towards the target area over which the platform is traveling is comprised of a plurality of frequencies. A plurality of receiver beams is ... | 01/06/1987 |
| 4326272 | Electronic intruder detection system An electronic detection system for detecting intruders employs a transmisn line as a sensing element. In one embodiment the transmission line is a modified surface-wave transmission line, for example, a Goubau line, which is positioned about the perimete... | 04/20/1982 |
