Pat. No.	Title
1.	5,706,820 Ultrasonic transducer with reduced elevation sidelobes and method for the manufacture thereof
2.	5,701,900 Ultrasonic transducer orientation sensing and display apparatus and method
3.	5,699,953 Multi resonance unibody ultrasonic transducer
4.	5,669,262 Removable ultrasonic transducer with integral electrical disconnect
5.	5,665,893 Reference block for determining operating characteristics of ultrasonic transducer in right circular cylinder type probe
6.	5,664,456 Ultrasonic transducer
7.	5,659,220 Ultrasonic transducer
8.	5,657,295 Ultrasonic transducer with adjustable elevational aperture and methods for using same
9.	5,654,510 Ultrasonic transducer apparatus for testing railroad wheels
10.	5,648,942 Acoustic backing with integral conductors for an ultrasonic transducer
11.	D380,440 Ultrasonic transducer housing
12.	5,637,947 Method and apparatus for operating a generator supplying a high-frequency power to an ultrasonic transducer
13.	5,637,800 Ultrasonic transducer array and manufacturing method thereof
14.	5,635,619 Apparatus and method for driving an ultrasonic transducer
15.	5,629,906 Ultrasonic transducer
16.	5,626,138 Ultrasonic transducer probe with axisymmetric lens
17.	5,619,476 Electrostatic ultrasonic transducer
18.	5,617,864 Method and apparatus for positioning an ultrasonic transducer and a display screen
19.	5,612,930 Ultrasonic transducer
20.	5,605,154 Two-dimensional phase correction using a deformable ultrasonic transducer array
21.	5,598,051 Bilayer ultrasonic transducer having reduced total electrical impedance
22.	5,595,328 Self isolating ultrasonic transducer
23.	5,583,293 Sonic or ultrasonic transducer
24.	5,581,144 Miniature, high efficiency dual frequency ultrasonic transducer with selectable beamwidth and apparatus
25.	5,578,888 Multi resonance unibody ultrasonic transducer
26.	5,578,758 Rail investigating ultrasonic transducer
27.	5,576,822 Ultrasonic transducer for brush detoning assist
28.	5,569,854 Apparatus and method for transmitting and receiving ultrasonic waves having an acoustoelectric, ultrasonic transducer
29.	5,565,628 Ultrasonic transducer with backing layer and acoustic matching layer having electrorheological fluid therein
30.	5,562,096 Ultrasonic transducer probe with axisymmetric lens
31.	5,555,887 Ultrasonic transducer probe with heat dissipating lens
32.	5,548,564 Multi-layer composite ultrasonic transducer arrays
33.	5,515,733 Ultrasonic transducer system with crosstalk isolation
34.	5,511,550 Ultrasonic transducer array with apodized elevation focus
35.	5,503,152 Ultrasonic transducer assembly and method for three-dimensional imaging
36.	5,493,541 Ultrasonic transducer array having laser-drilled vias for electrical connection of electrodes
37.	5,492,014 Ultrasonic transducer for monitoring acoustic emissions
38.	5,488,957 System and method for promoting adhesion between lens and matching layer of ultrasonic transducer
39.	5,488,956 Ultrasonic transducer array with a reduced number of transducer elements
40.	5,488,954 Ultrasonic transducer and method for using same
41.	5,477,736 Ultrasonic transducer with lens having electrorheological fluid therein for dynamically focusing and steering ultrasound energy
42.	5,469,011 Unibody ultrasonic transducer
43.	5,467,321 Insertion ultrasonic transducer with mode conversion and method for reducing multiple signal reception
44.	5,465,897 Bonded ultrasonic transducer and method for making
45.	5,460,181 Ultrasonic transducer for three dimensional imaging
46.	5,460,179 Ultrasonic transducer assembly and method of scanning
47.	5,458,120 Ultrasonic transducer with magnetostrictive lens for dynamically focussing and steering a beam of ultrasound energy
48.	5,457,863 Method of making a two dimensional ultrasonic transducer array
49.	5,456,259 Ultrasonic transducer arrangement and catheter
50.	5,452,267 Midrange ultrasonic transducer

For more information see:
Focus on Transducers in NDTnet 03/98