| Patents for H03H 9 - Networks comprising electromechanical or electro-acoustic elements; Electromechanical resonators (20,116) |
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| 04/17/1991 | EP0422637A2 Surface acoustic wave device and communication apparatus |
| 04/09/1991 | US5006824 Third mode torsional F-M resonator |
| 04/09/1991 | US5006750 Dismountable device for supporting a piezoelectric resonator inside a casing |
| 03/19/1991 | US5001483 Digital to analog converter for an acoustic charge transport device |
| 03/19/1991 | US5001383 Longitudinal quartz crystal resonator |
| 03/19/1991 | CA1281811C Electronic oscillator crystal wafer mount assembly |
| 03/19/1991 | CA1281810C Mounting of saw devices |
| 03/12/1991 | US4999535 Saw transducer with improved bus-bar design |
| 03/06/1991 | EP0415063A2 A multiplexed surface acoustical wave apparatus |
| 03/06/1991 | EP0156808B1 Apparatus for suppression of spurious attenuation poles in crystal filters |
| 03/06/1991 | CN1011934B Synchronizing signal extracting sound surface wave filter |
| 02/27/1991 | CN2072296U Filter base for sound surface wave |
| 02/26/1991 | US4995149 Method for hermetically sealing electronic devices |
| 02/21/1991 | DE4026000A1 Acoustic surface wave component with piezoelectric substrate - has input converter assemblies with several pairs of input wave converters behind each other, orthogonal to propagation direction |
| 02/20/1991 | EP0413634A2 ID card |
| 02/19/1991 | US4994772 Acoustic charge transport processor |
| 02/13/1991 | EP0412855A1 Electric/acoustic and acoustic/electric transducers for surface wave device with reduced diffraction and corresponding surface wave device |
| 02/13/1991 | EP0412854A1 Improved acoustoelectric surface wave device |
| 02/12/1991 | US4993000 Surface acoustic wave device |
| 02/12/1991 | US4992694 Piezoelectric crystal element on the basis of GAPO4 |
| 02/12/1991 | US4992693 Piezo-resonator |
| 02/07/1991 | WO1991001593A1 Saw device tapped delay line and apparatus using same |
| 02/06/1991 | CN1049078A Hall "fork "filter |
| 02/05/1991 | US4990817 Chip type electronic part |
| 02/05/1991 | US4990814 Separated substrate acoustic charge transport device |
| 01/30/1991 | CN1011457B Ultrasonic delay line |
| 01/29/1991 | US4989064 Insulating and protective layers |
| 01/24/1991 | DE3922671A1 Acousto-electronic device with surface wave arrangement - and IC on support, with layer structure with semiconductor crystal layer on another part of support |
| 01/22/1991 | US4986670 Temperature measurement device |
| 01/16/1991 | CN1048636A Surface acoustic wave device |
| 01/15/1991 | US4985709 Magnetostatic wave device |
| 01/15/1991 | US4985655 Crystal header package |
| 01/09/1991 | EP0407163A2 Surface acoustic wave device |
| 01/09/1991 | EP0406962A2 A filter |
| 01/09/1991 | EP0406917A1 Oscillator |
| 01/08/1991 | US4983937 Magnetostatic wave band-pass-filter |
| 01/08/1991 | CA2020365A1 Filter |
| 12/31/1990 | WO1991000645A1 Surface wave filter in quasi symmetrical double ring |
| 12/31/1990 | CA2062734A1 Surface wave filter in near symmetric double ring |
| 12/25/1990 | US4980598 Monolithic resonator for a vibrating beam accelerometer |
| 12/25/1990 | US4980596 Acoustic charge transport device having direct optical input |
| 12/18/1990 | US4978879 Acoustic surface wave element |
| 12/17/1990 | WO1990016040A1 Process for compensating the non-uniformity of a surface wave convolver |
| 12/17/1990 | CA2058961A1 Process for compensating the non-uniformity of a surface wave convolver |
| 12/12/1990 | EP0401737A2 Saw filter and mobile telephone using same |
| 12/04/1990 | US4975892 Piezoelectric transducer to generate bulk waves |
| 12/02/1990 | WO1990015479A1 Acoustically coupled antenna |
| 12/02/1990 | CA2056367A1 Acoustically coupled antenna |
| 12/02/1990 | CA2017510A1 Surface acoustic wave convolver and convolution integrator using same |
| 11/28/1990 | EP0399537A2 Surface acoustic wave device |
| 11/27/1990 | US4973875 Surface elastic wave device |
| 11/22/1990 | EP0397960A1 Ultrasonic catheter guidance system |
| 11/13/1990 | CA1276288C Restricted access television transmission system |
| 11/13/1990 | CA1276284C Surface elastic wave device |
| 10/31/1990 | EP0394480A1 Structure of surface acoustic wave transducer having small electrode gaps and method of producing the same |
| 10/31/1990 | DE4013214A1 Acoustic surface wave filter with input inter-digitised converters |
| 10/30/1990 | US4967166 Crystal oscillator and method for mounting the same |
| 10/30/1990 | US4966649 Hermetic sealing of recess gives self-oscillating hollow chamber; amplification |
| 10/24/1990 | CN1046420A Surface acoustic wave device |
| 10/23/1990 | US4965479 Surface transverse wave resonator |
| 10/23/1990 | CA1275492C Wideband saw channelizer using slanted array input transducer |
| 10/18/1990 | DE4011978A1 Saw device with deflection of undesired components - has waveguide to tap-off components propagating obliquely to interdigitated electrodes |
| 10/17/1990 | EP0392879A2 Surface acoustic wave device |
| 10/17/1990 | EP0392449A1 Surface acoustic wave device |
| 10/04/1990 | WO1990011620A1 Electrostatic surface wave converter with non-piezoelectric semiconductor substrate |
| 10/04/1990 | DE3910164A1 Elektrostatischer wandler zur erzeugung von akustischen oberflaechenwellen auf nicht piezoelektrischem halbleitersubstrat An electrostatic transducer for generating acoustic oberflaechenwellen on non-piezoelectric semiconductor substrate |
| 09/26/1990 | EP0020729B1 Inductorless monolithic crystal filter network |
| 09/20/1990 | WO1990010953A1 Quartz resonator with mounting pedestals |
| 09/19/1990 | EP0387679A2 Surface acoustic wave band-pass filter |
| 09/19/1990 | CN1045495A Quartz resonator with mounting pedestals |
| 09/12/1990 | EP0386009A1 Surface wave device with conversion structure for preventing undesirable reflected waves. |
| 09/07/1990 | WO1990010313A1 Vibration-isolated mount for gt-cut crystals |
| 09/04/1990 | US4954795 Surface acoustic wave filter for suppressing surface to surface interference for a satellite communication receiver |
| 09/04/1990 | US4954793 Filter bank |
| 09/04/1990 | US4953834 Pendulum with bending spring joint |
| 09/04/1990 | CA1273701A1 Saw device with apodized idt |
| 08/28/1990 | US4952833 High density surface acoustic waveguide channelizer |
| 08/28/1990 | US4952832 Surface acoustic wave device |
| 08/23/1990 | DE4005184A1 Trapped-energy piezoelectric filter - has input and output on signal face, with opposing electrode inside and on other body face |
| 08/21/1990 | US4951146 Directionally controlled dispersive filtering for reducing co-channel interference |
| 08/21/1990 | US4951057 Inductive input/output coupling for a surface acoustic wave device |
| 08/21/1990 | US4950937 Method of making a resonator from a boule of lithium tetraborate and resonator so made |
| 08/21/1990 | US4950935 Surface-acoustic-wave convolver |
| 08/21/1990 | CA1273102A1 Piezoelectric resonator having an extremal sensitivityto external pressure constraints |
| 08/16/1990 | EP0275338B1 Pivotal-spring connection, and manufacturing method |
| 08/09/1990 | WO1990008965A1 Personalized passive identification device |
| 08/07/1990 | US4947073 Surface accoustic wave |
| 08/01/1990 | CN1009045B Acoustic surface wave tv medium-frequency filter with smooth pass band |
| 07/24/1990 | US4943751 Surface acoustic wave element |
| 07/17/1990 | US4942327 Solid state electronic device |
| 07/17/1990 | CA1271817A1 Surface elastic wave filter |
| 07/10/1990 | US4941133 Saw slanted array correlator (SAC) with separate amplitude compensation channel |
| 07/10/1990 | CA1271556A1 Constraining mount system for surface acoustic wave devices |
| 07/03/1990 | US4939487 Surface acoustic wave filter |
| 07/03/1990 | US4939403 Energy-trapping-by-frequency-lowering-type piezoelectric resonance device |
| 06/27/1990 | EP0375507A1 Delay device and system using the same |
| 06/27/1990 | EP0375360A2 Higher order transverse mode suppression in surface acoustic wave resonators |
| 06/20/1990 | EP0373606A1 A monolithic electro-acoustic device having an acoustic charge transport device integrated with a transistor |
| 06/20/1990 | EP0373605A1 Acoustic charge transport device having direct optical input |
| 06/20/1990 | EP0373602A2 Optically modulated acoustic charge transport device |