US PATENT SUBCLASS 367 / 74
.~.~ Format conversion

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

14  DF  SEISMIC PROSPECTING {4}
37  DF  .~ Land-reflection type {6}
74.~.~ Format conversion

DEFINITION

Classification: 367/74

Format conversion:

(under subclass 37) Subject matter wherein the information or intelligence pertaining to the discontinuity appears in an electric signal variable (e.g., amplitude) and is transferred to another signal variable (e.g., frequency).