Number | Name | Date | Kind |
---|---|---|---|
2081822 | Kimbell | May 1937 | |
3124674 | Edwards et al. | Mar 1964 | |
3327292 | Eriksson et al. | Jun 1967 | |
3505646 | Affel, Jr. et al. | Apr 1970 | |
3513440 | Wells | May 1970 | |
3594762 | Gardberg et al. | Jul 1971 | |
3697698 | Oswald et al. | Oct 1972 | |
3810627 | Levy | May 1974 | |
4032946 | Wakatsuki et al. | Jun 1977 | |
4951039 | Schwendeman et al. | Aug 1990 | |
5212636 | Nakazawa | May 1993 | |
5275400 | Weingardt et al. | Jan 1994 | |
5411258 | Wilson et al. | May 1995 | |
5476259 | Weingardt | Dec 1995 |
Number | Date | Country |
---|---|---|
2028554 | Mar 1980 | GBX |
2229565 | Sep 1990 | GBX |
Entry |
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IEEE Spectrum, Jul. 1994, "Higher Visibility for LEDs" picture, p. 33. |