Number | Name | Date | Kind |
---|---|---|---|
3786517 | Krause | Jan 1974 | |
4066268 | Borchard et al. | Jan 1978 | |
4731621 | Hayamizu et al. | Mar 1988 | |
4998238 | Mizunoe et al. | Mar 1991 | |
5317337 | Ewaldt | May 1994 | |
5518325 | Kahle | May 1996 | |
5552009 | Zager et al. | Sep 1996 | |
5781221 | Wen et al. | Jul 1998 | |
5797688 | Wen | Aug 1998 | |
5927208 | Hagstrom et al. | Jul 1999 | |
5967676 | Cutler et al. | Oct 1999 |
Number | Date | Country |
---|---|---|
31421 | Jul 1981 | EP |
2320912 | Jul 1998 | GB |
58-58876 | May 1981 | JP |
5-124182 | May 1993 | JP |
5-238005 | Sep 1993 | JP |
6-31906 | Feb 1994 | JP |
9-265760 | Oct 1997 | JP |
9701844 | Jan 1997 | WO |
Entry |
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Johnson, “Mechanism for Printing Concentric Circles for Use as Coded Indicia”; IBM Technical Disclosure Bulletin, vol. 15, No. 3, pp. 974-975, Aug. 1972. |