Number | Date | Country | Kind |
---|---|---|---|
3437976 | Oct 1984 | DEX |
Number | Name | Date | Kind |
---|---|---|---|
2587304 | Fiske, Jr. et al. | Feb 1952 | |
3255431 | Howatt | Jun 1966 | |
4433400 | DeReggi et al. | Feb 1984 | |
4544859 | Eoff | Oct 1985 |
Entry |
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P. A. Lewin, "Miniature Piezoelectric Polymer Ultrasonic Hydrophone Probes", Ultrasonics, pp. 213-215, Sep. 1981. |