Number | Name | Date | Kind |
---|---|---|---|
2167286 | Theobald | Jul 1939 | |
2591486 | Wilkinson, Jr. | Apr 1952 | |
3958242 | Sirven | May 1976 | |
4231043 | Semplak | Oct 1980 | |
4660050 | Phillips | Apr 1987 | |
5315307 | Tsui et al. | May 1994 | |
5619217 | Mailandt et al. | Apr 1997 |
Entry |
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IEEE Transactions on Industrial Electronics and Control Instrumentation, vol. IECI-22, No. 2, May 1975, pp. 224-228. |