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Class Information
Number: 181/122
Name: Acoustics > Geophysical or subsurface exploration > Seismic wave detection
Description: Subject matter wherein the system includes means for mechanically receiving the acoustical waves.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 4853691 |
Method of and apparatus for the acoustic signalling of cases of drowning in swimming pools |
Aug. 1, 1989 |
| 4849947 |
Acoustic ground vibration detector |
Jul. 18, 1989 |
| 4839872 |
Geophone with a sensitive element made of piezoelectric polymer |
Jun. 13, 1989 |
| 4811311 |
Seismic detector assembly having polarized terminals |
Mar. 7, 1989 |
| 4800542 |
Tilt sensor for resolving left-right ambiguity in underwater acoustic detection systems |
Jan. 24, 1989 |
| 4780863 |
Removable power supply for an ocean bottom seismometer |
Oct. 25, 1988 |
| 4764762 |
Earthquake alarm assembly |
Aug. 16, 1988 |
| 4694162 |
Sign bit optical-electrical geophone |
Sep. 15, 1987 |
| 4692906 |
Ocean bottom seisometer |
Sep. 8, 1987 |
| 4689997 |
Motion detector suitable for detecting earthquakes and the like |
Sep. 1, 1987 |
| 4662225 |
Seismic detector |
May. 5, 1987 |
| 4649524 |
Integrated acoustic network |
Mar. 10, 1987 |
| 4637001 |
Plug-in geophone case |
Jan. 13, 1987 |
| 4624140 |
Liquid medium capacitive displacement sensor |
Nov. 25, 1986 |
| 4615022 |
Symmetrically-suspended vertical-swing long-period pendulum means |
Sep. 30, 1986 |
| 4599713 |
Seismic detector |
Jul. 8, 1986 |
| 4536753 |
Self monitoring intruder detecting system of noise-cancelling vibration detectors |
Aug. 20, 1985 |
| 4400695 |
Electronic intruder detection system |
Aug. 23, 1983 |
| 4374378 |
Scanning seismic intrusion detection method and apparatus |
Feb. 15, 1983 |
| 4364033 |
Alarming seismometer |
Dec. 14, 1982 |
| 4361740 |
Seismic sensor apparatus |
Nov. 30, 1982 |
| 4300135 |
Seismic alarm system |
Nov. 10, 1981 |
| 4280206 |
Seismometers |
Jul. 21, 1981 |
| 4213194 |
Acoustic archeological mapping method |
Jul. 15, 1980 |
| 4155065 |
Optic scattering acoustic transducer |
May. 15, 1979 |
| 4138658 |
Recording ocean bottom device, such as a seismograph |
Feb. 6, 1979 |
| 4126203 |
Air-coupled seismic detector |
Nov. 21, 1978 |
| 4119173 |
Optical seismograph |
Oct. 10, 1978 |
| 4107643 |
Unidirectional horizontal seismometer |
Aug. 15, 1978 |
| 4092628 |
Seismic transducer unit for marshy terrains |
May. 30, 1978 |
| 3995223 |
Seismic-acoustic detection device |
Nov. 30, 1976 |
| 3990039 |
Tuned ground motion detector utilizing principles of mechanical resonance |
Nov. 2, 1976 |
| 3984804 |
Acoustic and seismic troop movement detector |
Oct. 5, 1976 |
| 3963093 |
Geophone noise reduction method |
Jun. 15, 1976 |
| 3942606 |
Method of land seismic exploration using flexible tubes |
Mar. 9, 1976 |
| 3934218 |
Apparatus and method for seismic exploration |
Jan. 20, 1976 |
| 3932834 |
Seismic transducer assembly for marshy terrains |
Jan. 13, 1976 |
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