Did You Know...
...that Thomas Edison's patent application on his phonograph was approved by the Patent Office in just seven weeks? In contrast, it took Gordon Gould, the inventor of the laser, 30 years to obtain his patent -- finally awarded in 1988!
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| Number | Title | Issue Date |
| 4577503 | Method and device for detecting a specific acoustic spectral feature A method and device for detecting a narrow acoustic spectral feature in a sample as described. The method uses an electrical frequency modulated (FM) signal that is obtained from a voltage controlled oscillator. The Fourier spectrum of this wave is a main... | 03/25/1986 |
| 4501150 | Acoustic polarimeter An acoustic polarimeter is provided for measuring the acoustic birefringence of a plate with parallel faces. The plate to be measured is fixed to one face of an acoustically isotropic body and to the other face are fixed transducers having their linear tr... | 02/26/1985 |
| 4397187 | Chamber for tesing acoustical transmission loss characteristics of sheet materials Acoustical transmission loss of sheet materials in the low frequency range is measured by utilizing a cylindrical test chamber containing a speaker directed towards the upper end to which the sheet material is mounted. Pressure gradient microphones are mo... | 08/09/1983 |
| 4367649 | Acoustic polarimeter An acoustic polarimeter for measuring the anisotropy of a sample comprises an electroacoustic transducer which transmits a high-frequency transverse acoustic wave and is fixed on a birefringent measuring plate. The acoustic wave is received by a second tr... | 01/11/1983 |
| 4280183 | Gas analyzer A gas analyzer for instantaneously testing the percentages of the components of a binary gas mixture comprising carbon dioxide and oxygen, or a ternary one also containing saturated steam, which is intended more particularly for the supply of fuel to an e... | 07/21/1981 |
| 4138894 | Transversal acoustic wave operating device The device comprises an elongated acoustic wave translating isotropic body and a pair of transducers applied over one of the two parallel end faces thereof. Said transducers are arranged with relatively crossed axes of linear transversal polarization. The... | 02/13/1979 |
| 4124895 | Acoustic measuring system A remote terminal for use in an acoustic measuring system comprises a measuring device including an input terminal supplied with an analog signal to be measured, an A/D converter for converting the analog signal to a digital signal and an output terminal ... | 11/07/1978 |
| 4121290 | Analog sound velocity calculator An analog apparatus for determining the velocity of sound at a selected position in a liquid media is provided with a means for representing the conductivity, temperature, and depth of the position in the form of analog voltages, and is further provided w... | 10/17/1978 |
| 4118782 | Digital sound velocity calculator A digital apparatus for determining the velocity of sound at a selected position in a liquid media is provided with a means for representing the conductivity, temperature and depth of the position in the form of digital numbers, and provides a digital cal... | 10/03/1978 |
| 4080837 | Sonic measurement of flow rate and water content of oil-water streams A method and apparatus for metering water content in an oil-water system by measuring sonic velocity in a flowing oil-water mixture, thereafter to determine flow rate to provide individual oil and water rates which may then be integrated to provide oil an... | 03/28/1978 |
| 4067225 | Capacitance type non-contact displacement and vibration measuring device and method of maintaining calibration A new capacitance type non-contact displacement and/or vibration measurement instrument sensing head is described together with a novel method of maintaining calibration of the instrument using such sensing head. The invention takes the form of a central ... | 01/10/1978 |
| 4015470 | Flow measuring method and apparatus Selected variables of a fluid flowing through a conduit are measured by transmitting acoustic pulses through the conduit wall and fluid stream along normal and oblique transmission paths between acoustic transducers located externally of the conduit, meas... | 04/05/1977 |
| 4009707 | Automatic acoustic impedance meter In an acoustic impedance meter used for evaluating the performance of the middle ear and tympanic membrane system; a sound source is coupled to the ear canal by means of an ear probe and a sound sensor in conjunction with an inverse feedback system mainta... | 03/01/1977 |
