US PATENT SUBCLASS 367 / 87
ECHO SYSTEMS

Current as of: June, 1999
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367 /   HD   COMMUNICATIONS, ELECTRICAL: ACOUSTIC WAVE SYSTEMS AND DEVICES

87ECHO SYSTEMS {6}
88  DF  .~> Side scanning or contour mapping sonar systems
89  DF  .~> Speed determination {1}
92  DF  .~> Parametric sonar
93  DF  .~> Presence or movement only detection {1}
95  DF  .~> Returned signal used for control {2}
99  DF  .~> Distance or direction finding {5}

DEFINITION

Classification: 367/87

ECHO SYSTEMS:

(under the class definition) Subject matter wherein intelligence or information about a foreign object or other discontinuity in the medium is communicated in an acoustic wave reflected from the object or other discontinuity.

SEE OR SEARCH THIS CLASS, SUBCLASS:

1, for systems for jamming or interfering with echo systems.

37, for echo systems wherein the medium is the earth.

SEE OR SEARCH CLASS

342, Communications: Directive Radio Wave Systems and Devices (e.g., Radar, Radio Navigation), appropriate subclasses for radio wave echo systems.