P

Inventor

JOHNSTONE ROBERT M

US12 patents
⚠️ This page may combine multiple inventors who share the name “JOHNSTONE ROBERT M”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.

PROLUME INC

3 patents
US5428912AJul 4, 1995

Indirectly illuminated sign

PROLUME INC112 citations96
US6026602AFeb 22, 2000

Apparatus and method of indirectly illuminating a sign

PROLUME INC68 citations93
US5542201AAug 6, 1996

Indirectly illuminated sign

PROLUME INC38 citations93

DUAL LITE MFG

3 patents
US5272605ADec 21, 1993

Canopy mounting device for exit signs and the like

DUAL LITE MFG66 citations95
US5461550AOct 24, 1995

Canopy mounting device for exit signs and the like

DUAL LITE MFG32 citations91
US4561203ADec 31, 1985

Opaque sign plaque with dual reflector illumination

DUAL LITE MFG46 citations84

DUAL LITE INC

3 patents
US4885474ADec 5, 1989

Connector assembly for plug-in energization and battery activation of an associated electrical apparatus

DUAL LITE INC20 citations81
USD314750SFeb 19, 1991

Male electrical connector

DUAL LITE INC15 citations72
USD314751SFeb 19, 1991

Female electrical connector

DUAL LITE INC3 citations61

GSEG LLC

2 patents
US5768814AJun 23, 1998

Exit sign with removable emergency power pack module

GSEG LLC58 citations94
US5727867AMar 17, 1998

Canopy mounting device for exit signs and the like

GSEG LLC11 citations73

JOHNSTONE ROBERT M

1 patent
US5247756ASep 28, 1993

Sign apparatus with insertible directional arrow

JOHNSTONE ROBERT M12 citations68