US PATENT SUBCLASS 333 / 150
.~ Delay lines including elastic surface wave propagation means

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

24 R  DF  COUPLING NETWORKS {15}
150.~ Delay lines including elastic surface wave propagation means {5}
151  DF  .~.~> Spurious signal or mode cancellation means
152  DF  .~.~> Variable delay
153  DF  .~.~> Including discontinuities within propagation means
154  DF  .~.~> Significant transmitting or receiving transducer structure
155  DF  .~.~> Temperature stabilization or compensation

DEFINITION

Classification: 333/150

Delay lines including elastic surface wave propagation means:

(under subclass 24) Subject matter wherein structure is provided for converting electric waves to surface acoustic waves, transmitting the surface acoustic waves to a means for reconverting the acoustic waves to electrical waves.

(1) Note. This subclass is limited to devices where significant acoustic wave transmission is along the free surface of the transmission media.

(2) Note. The delay is due to the lower velocity of the waves along the free surface of the transmission means. No significant wave transmission is realized through the interior of the transmission.

(3) Note. The transmission media may comprise either flat or curved surfaces of a piezoelectric medium or a nonpiezoelectric medium having a surface coating of piezoelectric material.

SEE OR SEARCH THIS CLASS, SUBCLASS:

193+, for filters employing surface acoustic waves.