Bizarre Patents
A helium-filled sun shade for protecting individuals engaged in outdoor activities.
PatentStorm News
Make the Most of Our Site
See this month's Top Inventors and Most Cited Patents.
Stay on top of the latest innovations by subscribing to an RSS feed.
Registered users: Manage your profile.
| Number | Title | Issue Date |
| 5723773 | Bubble detector The presence of bubbles on such photographic material, as is well known, results in significant defects in the photographic materials produced so that it is important, in the manufacture of such photographic materials, to detect the presence of such bubbl... | 03/03/1998 |
| 5684251 | Portable acoustic impedance data acquisition and analysis system A portable two microphone acoustic impedance data acquisition and analysis system provided in a lightweight, fully portable, battery powered instrument with a dual capability of either on-site or remote-site analysis of measured data on the acoustic imped... | 11/04/1997 |
| 5594174 | System and method for measuring acoustic reflectance A system and method of measuring the linear and nonlinear response of an unknown acoustic termination uses a small probe assembly containing a sound source and microphone to determine the reflection function of the unknown acoustic termination. The probe ... | 01/14/1997 |
| 5465469 | Method for measuring sound absorption power of a theater chair with a dummy representing a human being seated thereon There is provided a method for measuring a sound absorption power of a theater chair with a human being seated thereon. The method includes steps of disposing a theater chair which is an object of measurement in a measuring environment; disposing a dummy ... | 11/14/1995 |
| 5377546 | Multi-degree linear liner impedance testing device A device for permitting evaluation of the acoustic impedance of liner designs used to attenuate noise in engine aircraft inlet and exhaust ducts, and in particular multiple degree of freedom designs of the type which include a porous facesheet followed by... | 01/03/1995 |
| 4970656 | Analog drive for ultrasonic probe with tunable phase angle The system uses a tunable inductor in series with the piezoelectric crystal excitation transducer in the probe which has a flux modulation coil. The bias current through this flux modulation coil is controlled by the system. It is controlled such that the... | 11/13/1990 |
| 4966160 | Acoustic admittance measuring apparatus with wide dynamic range and logarithmic output An electrical circuit system for measuring the acoustic admittance of the ear cavity, for use in single and multiple tone tympanometry and acoustic reflex response testing, in which the probe tone applied to the ear cavity can be varied over a wide freque... | 10/30/1990 |
| 4786860 | Missing wire detector The absence of a wire (40) in proper position under the bonding tool (32) of an ultrasonic wire bonder is detected by energizing the bonder transducer (14) while the wire is pulled to break it after the second bond (B) has been made. The pulling of the wi... | 11/22/1988 |
| 4775960 | Method and device for measuring vibrational stresses and velocities of waves propagated within formations surrounding a wellbore A method for measuring vibrational stresses and velocities of waves propagated within formations surrounding a wellbore essentially consists in simultaneously measuring the vibrational stress and vibrational velocity produced by propagation of the vibrati... | 10/04/1988 |
| 4768379 | Method and apparatus for determining flow resistance of fully assembled acoustic liners Apparatus and method for determining the steady state flow resistance of face sheets on fully assembled acoustic duct liners. Resistance is measured by subjecting the liner to a sinusoidal acoustic pressure field at the face sheet surface. The pressure fi... | 09/06/1988 |
| 4763524 | Automatic underwater acoustic apparatus An automatic underwater acoustic impedance measuring apparatus is instrumented with transducers whose outputs are led to a computer for the automatic measurement of acoustic impedance. One hydrophone is positioned so that it senses the incident and reflec... | 08/16/1988 |
| 4732039 | Acoustic impedance measurement A flexible U-shaped channel is abutted against a surface to be measured, thereby forming an acoustic duct, with the surface forming one wall of the duct. An acoustic source injects sound waves into the duct traveling parallel with the surface in order to ... | 03/22/1988 |
| 4651566 | Portable impedance meter for non-destructive testing of sound absorbing panels A portable acoustic impedance measuring device 10 is provided for measuring the impedance properties of a panel 12. The device 10 includes a horn section 14 having a flexible plate 18. The plate 18 can assume the curvature of the duct panel 12. The horn s... | 03/24/1987 |
| 4648275 | Underwater acoustic impedance measuring apparatus An automatic underwater acoustic impedance measuring apparatus is instrumented with transducers whose outputs are led to a computer for the automatic measurement of acoustic impedance. One hydrophone is positioned so that is senses the incident and reflec... | 03/10/1987 |
| 4644794 | Acoustic guide for noise-transmission testing of aircraft The invention is an apparatus which allows selective testing of aircraft or other vehicular components without requiring disassembly of the vehicle or components. The invention consists of a broad-band noise source 11, a guide 12 to direct the acoustic en... | 02/24/1987 |
| 4614115 | Ultrasonic process and apparatus for monitoring and measuring the evolution with time of physico-chemical, biological or bacteriological phenomena Ultrasonic process and apparatus for monitoring and measuring the evolution with time of physico-chemical and biological phenomena. There is plunged into the medium or media (4) to be monitored a bar (3) into which ultrasound (2) is injected in order to c... | 09/30/1986 |
| 4601295 | Ear pathology diagnosis apparatus and method A method and apparatus for diagnosing pathologies of the ear, particularly pathologies such as otitis media, directs into the ear canal a sequence of acoustic waves covering a range of frequencies from a few hundred Hz to several kHz and determines the pr... | 07/22/1986 |
| 4580574 | Method and device for non-invasively monitoring the instantaneous fluctuations in the viscoelastic-related properties of a living tissue The invention provides an ultrasonic device for continuously and noninvasively monitoring instantaneous fluctuations in viscoelastic-related properties of tissue comprising a pair of substantially parallel spaced-apart piezoelectric transducers having a g... | 04/08/1986 |
| 4537630 | Acoustic impedance measurement An open-ended acoustic impedance tube is abutted against a material having a known acoustic impedance and a standing wave pattern is established in the tube. A first apparent impedance of the material is derived based on the standing wave pattern. A corre... | 08/27/1985 |
| 4479204 | Method of monitoring the spacial production of hydrocarbons from a petroleum reservoir In the injection of fluids into subsurface geological formations, such as for the purpose of recovering a mineral in that formation, it is important that the flow progress of that fluid is known at all points in the subsurface. This information is provide... | 10/23/1984 |
| 4445378 | Acoustic ground impedance meter Method and apparatus for measuring the acoustic impedance of a surface in which the surface is used to enclose one end of the chamber of a Helmholz resonator. Acoustic waves are generated in the neck of the resonator by a piston driven by a variable speed... | 05/01/1984 |
| 4406921 | Apparatus for improving linearity of electromechanical transducers An improved circuit for a transducer or loud-speaker as used in the measurement of acoustic quantities such as in impedance audiometers for providing accurate linear read outs.... | 09/27/1983 |
| 4403508 | Locating interfaces in vertically-layered materials and determining concentrations in mixed materials utilizing acoustic impedance measurements Measurement of the relative and actual value of acoustic characteristic impedances of an unknown substance, location of the interfaces of vertically-layered materials, and the determination of the concentration of a first material mixed in a second materi... | 09/13/1983 |
| 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 |
| 4325255 | Ultrasonic apparatus and method for measuring the characteristics of materials Ultrasonic apparatus and method measures the characteristics of materials by sensing changes in the impedance to applied drive excitation of an ultrasonic probe using a crystal sensor that is integral with the ultrasonic transducer.... | 04/20/1982 |
| 4320659 | Ultrasonic system for measuring fluid impedance or liquid level An ultrasonic system that measures either the impedance of a fluid or liquid level utilizes moderately directional, bulk SV mode sound waves generated by a transducer and propagated in a homogeneous, flaw-free solid member. The SV wave propagates in the s... | 03/23/1982 |
| 4305295 | Portable apparatus for measuring acoustic impedance at the surface of curved sound absorber The apparatus consists of a circular, flexible disc held at a constant distance from a curved absorbing surface by pins or flexible ribs. Sound from a loudspeaker is fed to the center of the disc and allowed to propagate radially in the space between disc... | 12/15/1981 |
| 4289143 | Method of and apparatus for audiometrically determining the acoustic impedance of a human ear In order to determine the acoustic impedance of a human ear at various static pressures, a probe tightly fitted to the pinna of the ear transmits a short acoustic pulse with a wide frequency spectrum (such as white noise) from an electroacoustic transduce... | 09/15/1981 |
| 4283953 | Method and apparatus for determining a granularity property of a subsurface formation around a borehole Techniques for a broad band high frequency acoustic investigation of a subsurface formation around a borehole are described utilizing a range of acoustic frequencies selected to produce detectable acoustic backscatter from grains within the subsurface for... | 08/18/1981 |
| 4249422 | Apparatus and process for determining the composition of fluid-filled cavities An apparatus and method for determining the material properties characterizing a fluid contained in a cavity inside a solid comprises analyzing the resonances in the amplitude of elastic waves scattered by the cavity. Specifically, the resonance positions... | 02/10/1981 |
| 4249421 | Method to determine the shear absorption of a rubberlike material The shear absorption of a viscoelastic material is determined by directing acoustical energy at the viscoelastic material and sampling the backscattered signals that result when compressional waves propagate through the material and are scattered by eithe... | 02/10/1981 |
| 4117731 | Pseudo continuous wave instrument A device for measuring acoustic properties and their changes in a sample of liquid, gas, plasma or solid. A variable frequency source is applied to the sample by means of a transducer to produce sound waves within the sample. The application of the variab... | 10/03/1978 |
| 3960004 | Method for measuring impedance Apparatus and method for measuring the impedance of oscillatory systems, or elements of such systems, which exhibit nonlinear behavior at high excitation amplitudes. Excitation of the element being tested, which element may be either acoustical, electrica... | 06/01/1976 |
| 3952578 | Scanning ultrasonic spectrograph for fluid analysis An apparatus for time delay acoustic spectrographic analysis of fluid composition uses frequency modulated ultrasonic vibrations which are transmitted through the fluid from a sending transducer to a receiving transducer. By scanning the frequency of the ... | 04/27/1976 |
