Number | Name | Date | Kind |
---|---|---|---|
3288915 | Hatfield | Nov 1966 | |
4577923 | Stipanuk et al. | Mar 1986 | |
4955820 | Yamada et al. | Sep 1990 | |
5057027 | Yamada et al. | Oct 1991 | |
5073118 | Grabbe et al. | Dec 1991 |
Number | Date | Country |
---|---|---|
0450770 | Nov 1991 | EPX |
63-269466 | Nov 1988 | JPX |
Entry |
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IBM Technical Disclosure Bulletin, vol. 21, No. 12, May 1979. |