Did You Know...
...that the first rickshaw was invented in 1869 by an American Baptist minister, the Rev. E. Jonathan Scobie, to transport his invalid wife around the streets of Yokohama?
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| Number | Title | Issue Date |
| 7190103 | Matching circuit for megasonic transducer device A method and apparatus for matching impedance magnitude and impedance phase for an acoustic-wave transducer load and an RF power source. The acoustic-wave transducer load has a load impedance magnitude and phase. The RF power source has a source impedance magnitude ... | 03/13/2007 |
| 6028484 | Ultrasound apparatus and method for amplifying transmit signals A method and system for amplifying an ultrasonic transmit signal is provided. A first amplifier stage has a first supply voltage input and receives transmit signals. A second amplifier stage has a second supply voltage input and receives transmit signals ... | 02/22/2000 |
| 5714917 | Device incorporating a tunable thin film bulk acoustic resonator for performing amplitude and phase modulation A method for amplitude modulating signals, and a circuit that operates in accordance with the method. The method includes a first step of applying a modulating low frequency signal having a time-varying voltage to a tunable resonator. The tunable resonato... | 02/03/1998 |
| 4928069 | Amplifying surface wave receiver An amplifying surface wave receiver for a surface wave element composed of a material which exhibits the piezo effect and which can be rendered electrically conductive by local doping, where a doped region is formed at the upper portion of an insulating s... | 05/22/1990 |
| 4839607 | Frequency-doubling amplifying surface wave receiver An amplifying surface wave receiver for a surface wave element composed of a material which has the piezo effect and which can be rendered electrically conductive by local doping wherein a doped region is formed at the upper portion of an insulating subst... | 06/13/1989 |
| 4636678 | Compensation of acoustic wave devices Compensation for the effects of environmentally caused changes and aging on piezoelectric acoustic wave devices is electrically provided by the application of a signal, such as a DC bias voltage, to the finger elements of an interdigital transducer formed... | 01/13/1987 |
| 4543533 | Parametric amplifier The parametric amplifier includes plurality of parameter changing or exciting regions provided in a periodic array on a wave propagation medium having the property that waves having different frequencies travel through the medium at different velocities, ... | 09/24/1985 |
| 4471255 | Surface acoustic wave parametric device An surface acoustic wave device, especially amplifier which includes input and output means for electrical signals provided so as to be spaced on a surface of a piezoelectric material which comprises a laminate in combination with a semiconductor, and an ... | 09/11/1984 |
| 4426732 | Receiver having a surface elastic wave high frequency amplifier with a frequency-controlled pump oscillator Receiver comprising at least two output means taking out electric signals corresponding to sound waves propagating in different directions in a surface elastic wave amplifier disposed in the high frequency amplifier stage, wherein phase difference or freq... | 01/17/1984 |
| 4365216 | Surface-acoustic-wave device A surface-acoustic-wave device wherein a plurality of metal strips (S) are provided on a propagation path of surface acoustic wave which is formed in a laminate comprised of a piezoelectric layer (23) and a semiconductor (1), the metal strips are extended... | 12/21/1982 |
| 4357553 | Surface-acoustic-wave device A surface-acoustic-wave device has a laminate formed of a semiconductor and a piezoelectric layer and a depletion layer control means locally provided at an interface portion of the semiconductor and said piezoelectric layer, wherein a parametric interact... | 11/02/1982 |
| 4333344 | System and method for testing the reaction of rare earth ions A crystalline bar is doped with a rare earth. The bar is transparent to ration, such as from a laser, at a light wavelength which excites the rare earth ions in the bar and the light is modulated at the frequency at which the bar mechanically resonates. ... | 06/08/1982 |
| 4288765 | Frequency selector apparatus A frequency selector apparatus which effects a frequency selection by providing at least one reflecting electrode at a position adjacent elastic surface wave transducer or transducers provided in an acoustic wave propagation track in a piezoelectric mediu... | 09/08/1981 |
| 4233530 | Elastic surface wave device An elastic surface wave device, especially amplifier which includes input and output means for electrical signals provided so as to be spaced on a surface of a piezoelectric material which composes a laminate in combination with a semiconductor, and an el... | 11/11/1980 |
| 4197483 | Submillimeter wave generation using surface acoustic waves in piezoelectric materials A generator for variable frequency submillimeter waves launches surface astic waves in piezoelectric material for generation of an associated acousto-electrical field. An electron beam is acted upon by the acousto-electrical field in a manner simulating ... | 04/08/1980 |
| 4088969 | Tapped surface acoustic wave delay line A tapped surface acoustic wave (SAW) delay line with time-resolved outputs sing piezoelectric leaky wave coupling and bulk wave amplification, and having low loss characteristics. A solid piezoelectric semiconductor is placed adjacent to a solid piezoelect... | 05/09/1978 |
| 4055816 | Voltage stress stabilized saw device An oscillator or similar device employing a frequency setting SAW element having a piezoelectric substrate and an arrangement of interdigital finger transducers mounted thereon. In one embodiment, two interdigital finger transducers provide surface acoust... | 10/25/1977 |
| 4054851 | Acoustic surface-wave filter An acoustic surface-wave filter comprises an element which is excitable to perform surface oscillations, which is formed at least partly of piezoelectric material and has interference locations for the surface wave on its surface together with electromech... | 10/18/1977 |
| 4025876 | Distributed feedback acoustic surface wave oscillator An acoustic surface wave oscillator is constructed from a semiconductor-piezoelectric acoustic surface wave amplifier by providing appropriate perturbations at the piezoelectric boundary. The perturbations cause Bragg order reflections that maintain acous... | 05/24/1977 |
| 4017751 | Elastic volume wave convolution device The invention relates to a device which forms the product of convolution of two signals available in electrical form. This device consists of a substrate of lead molybdate in which there are created, at the two ends, volume elastic waves, which are longit... | 04/12/1977 |
| 4016513 | Surface wave convolver apparatus Apparatus for convolving acoustic surface waves without dispersion comprising a piezoelectric substrate having surface acoustic waves generated at opposite ends thereof and directed towards an interaction region formed from a semiconductor film deposited ... | 04/05/1977 |
| 3990021 | Surface wave multifrequency oscillator A variable frequency VHF or UHF band oscillator is disclosed. Principal control over the precise location and stability of the frequency of oscillation is provided by a surface wave delay line in the regenerative feedback path of a broadband amplifier. Th... | 11/02/1976 |
| 3979697 | Frequency modulated saw oscillator An oscillator in which the "tank circuit" or feedback element is a surface acoustic wave (SAW) bandpass filter (delay line). A modulating voltage is applied from end-to-end of the piezoelectric substrate material to provide an incremental change of physic... | 09/07/1976 |
