Number | Date | Country | Kind |
---|---|---|---|
2-118817 | May 1990 | JPX | |
2-148636 | Jun 1990 | JPX | |
2-168438 | Jun 1990 | JPX |
Number | Name | Date | Kind |
---|---|---|---|
2500891 | Alexander | Apr 1950 | |
2502371 | Darby | Mar 1950 | |
2557089 | Gamrath et al. | Jun 1951 | |
2831824 | White | Apr 1958 | |
3842027 | Richardson | Oct 1974 | |
4098753 | Tsigdinos et al. | Jul 1978 | |
4343732 | Zama et al. | Aug 1982 | |
4670494 | Semenza | Jun 1987 |
Entry |
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Patent Abstracts of Japan, Abstract of JP-A-59113046. |