US PATENT SUBCLASS 310 / 313 D
.~.~.~.~ Grating or reflector in wave path

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  DF  .~.~ Surface acoustic wave devices {2}
313 B  DF  .~.~.~ Interdigitated electrodes {2}
313 D.~.~.~.~ Grating or reflector in wave path

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.

SEE OR SEARCH THIS CLASS, SUBCLASS:

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".

SEE OR SEARCH CLASS

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.