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| US4005538 | 29 Ago 1975 | 1 Feb 1977 | Minnesota Mining and Manufacturing Company | Internally illuminated retroreflective signs |
| US4250646 | 21 May 1979 | 17 Feb 1981 | | Highway sign |
| US5213872 | 19 Abr 1991 | 25 May 1993 | Stimsonite Corporation | Preprinted retroreflective highway sign and method for making the sign |
| US5310436 | 7 Ago 1992 | 10 May 1994 | Stimsonite Corporation | Preprinted retroreflective highway sign and method for making the sign |
