Did You Know...
...that the inventor of the electric motor was a blacksmith named Thomas Davenport? Described as "a brilliantly unsuccessful inventor", Davenport invented the first rotary electric motor. In 1836 he headed out -- on foot -- from his Vermont home to file a patent application at the Patent Office in Washington, D.C. By the time he got there, he had squandered away his money and couldn't afford the $30 filing fee so he turned around and went home. When he later mailed in his application with money he'd raised, the Patent office was destroyed in a fire. He did finally get credit for his invention on Feb. 5, 1837.
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| Number | Title | Issue Date |
| 4079364 | Water safety alarm apparatus An alarm apparatus which is activated upon immersion. The apparatus is adapted to be worn whenever the wearer is expected to be in the proximity of a body of open water and will sound an alarm should that wearer fall into the water. The apparatus is porta... | 03/14/1978 |
| 4075601 | Combined pipeline marker and test unit An acoustic type of pipeline marker that has combined with it, as a unitary structure, an acoustic signal detector for determining whether the marker is operating. The detector is only energized when it is desired to check whether the marker is emitting t... | 02/21/1978 |
| 4069469 | System for collecting information in water A submersible which can automatically move along the cable laid under water, has a sensor, and the information collected or gathered by said sensor is forwarded to the control unit on land through said cable. The submersible is for instance connected acou... | 01/17/1978 |
| 4065746 | Device for measuring the velocity of a body in an undersea environment A hollow, projectile-shaped body containing an acoustical transducer is rased into the sea such that the body descends in free fall until it strikes and penetrates the sea floor, coming to a rest therein. Acoustic signals emanating from the acoustic tran... | 12/27/1977 |
| 4050819 | Undersea ranging-communications from altitude via laser An optical means for detecting and/or communicating with underwater objects rom airborne platforms wherein a number of laser sources are collimated so as to illuminate a particular portion of the ocean surface from the airborne platform. Thereafter, use is... | 09/27/1977 |
| 4044611 | Expendable oceanography probe An expendable oceanography probe has a hollow cylindrical housing, a front end element in the form of a weight fitted into the lower end of the cylindrical housing, a sensor, such as a thermistor, mounted on the external surface of the front end element f... | 08/30/1977 |
| 4045767 | Method of ultrasonic data communication and apparatus for carrying out the method In an ultrasonic data communication system, each datum is represented by a specific ultrasonic wave signal composed of plural frequency components arranged according to a specific one of predetermined frequency permutations so that the data transmission t... | 08/30/1977 |
| 4027286 | Multiplexed data monitoring system A multiplexed data monitoring system for use in monitoring the status of control valves or the like in subsea petroleum well control systems, utilizes an encoder circuit located externally of the control module and composed of passive electrical component... | 05/31/1977 |
| 4020449 | Signal transmitting and receiving device A signal to be transferred comprises a plurality of patterns each including a time region containing a plurality of frequency signals and a time region containing no frequency signal. When a signal to be transmitted is given in the form of numeric informa... | 04/26/1977 |
| 4007331 | Apparatus for demodulation of relative phase modulated binary data A digital system is disclosed for demodulating relative phase-shift modulated binary data using a delay circuit to store one data bit period of sample bits for phase comparison with the next data bit period of sample bits, and a cascaded delay circuit of ... | 02/08/1977 |
| 3958214 | Encoded echo-ranging signal generator 1. An encoded echo-ranging signal generator comprising in combination; A digital shift register having a plurality of binary encoded stages, A shift pulse generator coupled to said digital shift register for the tiy shifting thereof, An anti-coincidence circuit ha... | 05/18/1976 |
| 3958215 | Device for the acoustic submarine teletyping This invention involves the acoustical transmission of messages from an individual operating under water to persons operating on the surface. A wrist-mounted, keyboard-actuated, acoustical signal generator is provided, having means to generate and amplify... | 05/18/1976 |
| 3939461 | Correlation system using matched signals 4. A signal-reconstitution method for signals transmitted through a bounded medium comprising the steps of: Propagating a first signal from one point in said bounded medium; Receiving the propagated signal at another point in said bounded medium; Propagating the re... | 02/17/1976 |
| 3932833 | Instrument for direct measurement of the velocity of sound in a fluid This invention provides an expendable velocimeter probe. High frequency transmitting and receiving transducers are mounted opposite to one another in axial alignment on the probe body and on a frame in front of the body. The mounting includes means for ac... | 01/13/1976 |
