US PATENT SUBCLASS 333 / 141
.~ Delay lines including elastic bulk 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}
141.~ Delay lines including elastic bulk wave propagation means {7}
142  DF  .~.~> Multipath propagation {1}
144  DF  .~.~> Variable delay
145  DF  .~.~> Nonuniform propagation path
146  DF  .~.~> Helical propagation path
147  DF  .~.~> Propagation path has significant chemical or physical properties
148  DF  .~.~> Including magnetostrictive transducers
149  DF  .~.~> Significant transducer structure

DEFINITION

Classification: 333/141

Delay lines including elastic bulk wave propagation means:

(under subclass 24) Subject matter for retarding wave energy a predetermined time over a range of frequencies and systems within the class definition which include such networks wherein structure is provided for converting electrical wave energy to bulk wave mechanical energy, and for transmitting the bulk wave mechanical energy for reconversion to electrical wave energy.

(1) Note. The time period may be constant over the range of frequencies or proportional to the frequency (e.g., the time of delay may be greater for the higher frequency).

(2) Note. The delay is due to the lower propagation velocity of waves in the mechanical wave transmission path.

(3) Note. Included as mechanical wave transmission devices in this subclass are such devices as fluid columns, bars, rods, and plates.

(4) Note. By elastic bulk wave propagation is meant energy transmitted through the interior of an elastic wave propagation medium.

SEE OR SEARCH THIS CLASS, SUBCLASS:

186+, for electromechanical filters employing bulk mode resonators.

SEE OR SEARCH CLASS 74, Machine Element or Mechanism, appropriate subclasses, especially

1, for mechanical systems of linkages to shift the phase of a wave.

310, Electrical Generator or Motor Structure,

313, for piezoelectric surface acoustic wave devices;

subclasses 334+ for various acoustic wave devices which use piezoelectric effects; and subclass 26 for miscellaneous magnetostrictive devices, per se.

318, Electricity: Motive Power Systems,

116, for piezoelectric motors; and subclass 118 for magnetostrictive motors.

322, Electricity: Single Generator Systems,

3, for magnetostrictive generator systems.

343, Communications: Radio Wave Antennas,

5+, for radar and other reflected wave radio systems used to measure distance and which use delay networks, see especially subclasses 9, 10+, and 12+.

367, Communications, Electrical: Acoustic Wave Systems and Devices, 141, for underwater vibration transducers.

381, Electrical Audio Signal Processing Systems and Devices,

150+, for telephone transmitters and receivers using magnetostrictive or piezoelectric effects.