US PATENT SUBCLASS 363 / 11
.~.~ By electron tube converter

Current as of: June, 1999
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363 /   HD   ELECTRIC POWER CONVERSION SYSTEMS

1  DF  CASCADED OR COMBINED, DIVERSE CONVERSIONS IN WHICH THE FREQUENCY OR PHASE OR COMBINED CONVERSION IS WITHOUT INTERMEDIATE CONVERSION TO D.C. {3}
9  DF  .~ Combined phase and frequency conversion (i.e., Ph1f1-Ph2f2) {3}
11.~.~ By electron tube converter

DEFINITION

Classification: 363/11

By electron tube converter:

(under subclass 9) Subject matter wherein the converter means includes an electron tube device.

SEE OR SEARCH THIS CLASS, SUBCLASS:

151, for phase conversion by electron tube converter.

166, for frequency conversion by electron tube converter.