US Patent Class 367-- COMMUNICATIONS, ELECTRICAL: ACOUSTIC WAVE SYSTEMS AND DEVICES-- MAIN HEADINGS

US Patent Class 367
COMMUNICATIONS, ELECTRICAL: ACOUSTIC WAVE SYSTEMS AND DEVICES-- Main Headings

		CLASS NOTES
1	DF	SONAR COUNTER-MEASURES
2	DF	TRANSPONDERS {2}
7	DF	ACOUSTIC IMAGE CONVERSION {2}
12	DF	BEAM STABILIZATION OR COMPENSATION
13	DF	TESTING, MONITORING, OR CALIBRATING
14	DF	SEISMIC PROSPECTING {4}
81	DF	WELLBORE TELEMETERING {2}
86	DF	BOREHOLE TESTING
87	DF	ECHO SYSTEMS {6}
117	DF	PLURAL TRANSMITTERS TO RECEIVER OR TRANSMITTER TO PLURAL RECEIVERS
197	DF	SELECTIVE (E.G., REMOTE CONTROL) {2}
118	DF	DISTANCE OR DIRECTION FINDING {6}
131	DF	UNDERWATER SYSTEM {3}
135	DF	RECEIVER CIRCUITRY {1}
137	DF	TRANSMITTER SYSTEMS {2}
140	DF	SIGNAL TRANSDUCERS {4}
191	DF	MISCELLANEOUS
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		CROSS-REFERENCE ART COLLECTIONS
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900	DF	SONAR TIME VARIED GAIN CONTROL SYSTEMS
901	DF	NOISE OR UNWANTED SIGNAL REDUCTION IN NONSEISMIC RECEIVING SYSTEM
902	DF	SPEED OF SOUND COMPENSATION
903	DF	TRANSMIT-RECEIVE CIRCUITRY
904	DF	DOPPLER COMPENSATION SYSTEMS
905	DF	SIDE LOBE REDUCTION OR SHADING
906	DF	AIRBORNE SHOCK-WAVE DETECTION
907	DF	COORDINATE DETERMINATION
908	DF	MATERIAL LEVEL DETECTION, E.G., LIQUID LEVEL
909	DF	COLLISION AVOIDANCE
910	DF	PORTABLE SONAR DEVICES
911	DF	PARTICULAR WELL-LOGGING APPARATUS {1}