Number | Name | Date | Kind |
---|---|---|---|
4722878 | Watakabe et al. | Feb 1988 | A |
4738907 | Shigetomi et al. | Apr 1988 | A |
4873163 | Watakabe et al. | Oct 1989 | A |
4876164 | Watakabe et al. | Oct 1989 | A |
4985319 | Watakabe et al. | Jan 1991 | A |
5126231 | Levy | Jun 1992 | A |
5489489 | Swirbel et al. | Feb 1996 | A |
5948570 | Kornblit et al. | Sep 1999 | A |
6472107 | Chan | Oct 2002 | B1 |
Number | Date | Country |
---|---|---|
56130750 | Oct 1981 | JP |
86048705 | Oct 1986 | JP |
61255347 | Nov 1986 | JP |
4371954 | Dec 1992 | JP |
Entry |
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IBM Technical disclosure Bulletin; NN79054788; “Multi-density Mask”; May 1979. |