US PATENT SUBCLASS 333 / 193
.~.~ Using surface acoustic waves

Current as of: June, 1999
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333 /   HD   WAVE TRANSMISSION LINES AND NETWORKS

24 R  DF  COUPLING NETWORKS {15}
186  DF  .~ Electromechanical filter {5}
193.~.~ Using surface acoustic waves {3}
194  DF  .~.~.~> Including spurious signal prevention or reduction means
195  DF  .~.~.~> With wave-modifying means (e.g., reflectors, resonators, diffractors, multistrip couplers, etc.)
196  DF  .~.~.~> With response weighting means

DEFINITION

Classification: 333/193

Using surface acoustic waves:

(under subclass 186) Subject matter wherein mechanical wave energy within a desired frequency band is transmitted in the form of acoustic waves propagating principally along a free

surface or a guiding substrate.

(1) Note. The substrate is usually piezoelectric or comprises a surface coated with material having piezoelectric properties.

(2) Note. The surface waves are excited by transducers having a desired frequency selectively.