Inventor · disambiguated record
Robert M. Johnstone
Also filed as: JOHNSTONE ROBERT M
12 granted patents·481 citations·filing 1983–1997
94Inventor score
Top patents by PatentIndex Score
12 records- 0192US5428912AIndirectly illuminated signPROLUME INC·Filed 1993·Granted Jul 4, 1995·112 cites·13 claims
- 0291US5272605ACanopy mounting device for exit signs and the likeDUAL LITE MFG·Filed 1992·Granted Dec 21, 1993·66 cites·43 claims
- 0389US6026602AApparatus and method of indirectly illuminating a signPROLUME INC·Filed 1997·Granted Feb 22, 2000·68 cites·18 claims
- 0483US5768814AExit sign with removable emergency power pack moduleGSEG LLC·Filed 1993·Granted Jun 23, 1998·58 cites·30 claims
- 0576US5461550ACanopy mounting device for exit signs and the likeDUAL LITE MFG·Filed 1993·Granted Oct 24, 1995·32 cites·29 claims
- 0675US5542201AIndirectly illuminated signPROLUME INC·Filed 1995·Granted Aug 6, 1996·38 cites·23 claims
- 0775US4561203AOpaque sign plaque with dual reflector illuminationDUAL LITE MFG·Filed 1983·Granted Dec 31, 1985·46 cites·10 claims
- 0874USD314750SMale electrical connectorDUAL LITE INC·Filed 1988·Granted Feb 19, 1991·15 cites·1 claims
- 0949US4885474AConnector assembly for plug-in energization and battery activation of an associated electrical apparatusDUAL LITE INC·Filed 1989·Granted Dec 5, 1989·20 cites·14 claims
- 1048US5727867ACanopy mounting device for exit signs and the likeGSEG LLC·Filed 1995·Granted Mar 17, 1998·11 cites·15 claims
- 1141USD314751SFemale electrical connectorDUAL LITE INC·Filed 1988·Granted Feb 19, 1991·3 cites·1 claims
- 1239US5247756ASign apparatus with insertible directional arrowJOHNSTONE ROBERT M·Filed 1992·Granted Sep 28, 1993·12 cites·8 claims
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