Number | Name | Date | Kind |
---|---|---|---|
3918563 | Schwippert et al. | Nov 1975 | |
4733766 | Roberts et al. | Mar 1988 | |
4848556 | Shah et al. | Jul 1989 | |
5407049 | Jacobs | Apr 1995 | |
5407051 | Wohlrab | Apr 1995 | |
5469952 | Kershaw et al. | Nov 1995 |
Number | Date | Country |
---|---|---|
0 725 374 A2 | Aug 1996 | EPX |
645201 | Sep 1984 | CHX |
661350 | Jul 1987 | CHX |
Entry |
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G.R. Crane, "Poly (vinylidene) Fluoride Used for Piezoelectric Coin Sensors," IEEE Trans. on Sonics and Ultrasonics, vol. SU-25, No. 6, pp. 393-395 (Nov. 1978). |