Number | Name | Date | Kind |
---|---|---|---|
3974184 | Umezawa et al. | Aug 1976 | |
4264509 | Zilliken | Apr 1981 | |
4366082 | Zilliken | Dec 1982 | |
4390559 | Zilliken | Jun 1983 | |
5320949 | Shen | Jun 1994 | |
5554519 | Weber et al. | Sep 1996 | |
5637561 | Shen et al. | Jun 1997 | |
5637562 | Shen et al. | Jun 1997 |
Entry |
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