| Patents for H04B 11 - Transmission systems employing ultrasonic, sonic or infrasonic waves (1,545) |
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| 05/22/1979 | CA1055126A1 Acoustic wave devices involving perturbation of acoustic velocity by diffusion of metals |
| 04/10/1979 | CA1052450A1 Lock-in noise rejection circuit |
| 04/03/1979 | US4147222 Acoustical underwater communication system for command control and data |
| 10/17/1978 | US4120389 Proximity sensor |
| 10/10/1978 | US4119941 Acoustic coupler |
| 09/12/1978 | US4114135 Acoustic device |
| 08/29/1978 | US4110725 Sequential tone acoustic command link |
| 08/22/1978 | US4109233 Proximity sensor |
| 08/22/1978 | US4109100 Reverberation compensating communication system |
| 08/08/1978 | US4105992 Animal attraction method and apparatus |
| 06/27/1978 | US4097838 Seismic rodent control device |
| 06/20/1978 | US4096466 Underwater switching |
| 06/20/1978 | US4095667 Portable underwater signalling transducer |
| 05/23/1978 | US4091357 Receiving system of telemetering signal |
| 05/16/1978 | US4090169 Method and apparatus for determining relative phase and sensitivity of elements in an acoustic array |
| 02/14/1978 | US4073341 Acoustically controlled subsurface safety valve system |
| 01/17/1978 | US4069469 System for collecting information in water |
| 12/27/1977 | US4065747 Acoustical underwater communication system for command control and data |
| 12/27/1977 | US4064806 Ultrasonic remote control system |
| 12/13/1977 | US4063215 High fidelity low frequency transducer for use at great depth |
| 08/30/1977 | US4045767 Method of ultrasonic data communication and apparatus for carrying out the method |
| 08/02/1977 | US4039999 Communication system |
| 07/26/1977 | US4038632 Oil and gas well disaster valve control system |
| 05/17/1977 | US4024491 Wireless marine navigational aid system |
| 04/26/1977 | US4020449 Signal transmitting and receiving device |
| 04/19/1977 | US4019148 Lock-in noise rejection circuit |
| 01/11/1977 | US4002984 Circuit arrangement for determining the time duration of received oscillations |
| 11/02/1976 | US3990071 Data transmission system using frequency permutation codes |
| 08/10/1976 | US3974475 Method of and apparatus for focusing ultrasonic waves in a focal line |
| 07/27/1976 | US3971317 Detonation system and method |
| 07/20/1976 | US3970987 Acoustical switch |
| 06/15/1976 | US3964013 Cavitating parametric underwater acoustic source |
| 06/01/1976 | US3961308 Oil and gas well disaster valve control system |
| 06/01/1976 | US3961291 Apparatus and method for mapping acoustic fields |
| 05/25/1976 | US3959770 Method and apparatus for error compensation in multichannel systems |
| 05/18/1976 | US3958215 Device for the acoustic submarine teletyping |
| 04/06/1976 | US3949351 Variable delay line |
| 03/30/1976 | US3946831 Acoustic transmitter |
| 03/23/1976 | US3946377 Method and apparatus to monitor conduction of sonic waves in an acoustically conductive medium |
| 03/23/1976 | US3946338 Acoustic wave devices involving perturbation of acoustic velocity by diffusion of metals |
| 03/02/1976 | US3942176 Ultrasonic alarm system |
| 02/24/1976 | US3940733 Seismic surveillance system |
| 02/17/1976 | US3939465 Remote underwater device activating system |
| 02/17/1976 | US3939461 Correlation system using matched signals |
| 01/20/1976 | US3934219 Acoustic method and apparatus for determining effectiveness of mine passage seal |