US PATENT SUBCLASS 310 / 313 R
.~.~ Surface acoustic wave devices

Current as of: June, 1999
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310 /   HD   ELECTRICAL GENERATOR OR MOTOR STRUCTURE

300  DF  NON-DYNAMOELECTRIC {4}
311  DF  .~ Piezoelectric elements and devices {17}
313 R.~.~ Surface acoustic wave devices {2}
313 A  DF  .~.~.~> Orientation of piezoelectric material
313 B  DF  .~.~.~> Interdigitated electrodes {2}

Unofficial Alpha Subclasses: R A B C D

DEFINITION

Classification: 310/313

Surface acoustic wave devices:

(under subclass 311) Subject matter wherein a piezoelectric element is combined with, or comprises, a material or body having an elastic surface on which varying mechanical stresses produced by the piezoelectric element travel.

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334, for piezoelectric generators of acoustic waves which travel through a body or material rather than on the surface of the body or material, e.g., "bulk mode".

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235, Registers,

181, and 197 for devices wherein the surface wave device functions as a correlator or convolver.

333, Wave Transmission Lines and Networks,

157+, for devices wherein the waveguide serves as a delay line, and subclasses 187+ where the surface wave device performs as an electric filter.