Robert M. Johnstone

Person

Shelton, CT, US

People

Patents Grantslast 30 patents

Information Patent Grant
Apparatus and method of indirectly illuminating a sign
- Patent number 6,026,602
- Issue date Feb 22, 2000
- Prolume, Inc.
- Daniel J. Grondal
- G09 - EDUCATION CRYPTOGRAPHY DISPLAY ADVERTISING SEALS
Information Patent Grant
Exit sign with removable emergency power pack module
- Patent number 5,768,814
- Issue date Jun 23, 1998
- GSEG LLC
- Edward P. Kozek
- G09 - EDUCATION CRYPTOGRAPHY DISPLAY ADVERTISING SEALS
Information Patent Grant
Canopy mounting device for exit signs and the like
- Patent number 5,727,867
- Issue date Mar 17, 1998
- GSEG LLC
- Robert M. Johnstone
- G08 - SIGNALLING
Information Patent Grant
Indirectly illuminated sign
- Patent number 5,542,201
- Issue date Aug 6, 1996
- Prolume, Inc.
- Daniel J. Grondal
- G09 - EDUCATION CRYPTOGRAPHY DISPLAY ADVERTISING SEALS
Information Patent Grant
Canopy mounting device for exit signs and the like
- Patent number 5,461,550
- Issue date Oct 24, 1995
- Dual-Lite Manufacturing, Inc.
- Robert M. Johnstone
- G08 - SIGNALLING
Information Patent Grant
Indirectly illuminated sign
- Patent number 5,428,912
- Issue date Jul 4, 1995
- Prolume Incorporated
- Daniel J. Grondal
- G09 - EDUCATION CRYPTOGRAPHY DISPLAY ADVERTISING SEALS
Information Patent Grant
Canopy mounting device for exit signs and the like
- Patent number 5,272,605
- Issue date Dec 21, 1993
- Dual-Lite Manufacturing, Inc.
- Robert M. Johnstone
- G08 - SIGNALLING
Information Patent Grant
Sign apparatus with insertible directional arrow
- Patent number 5,247,756
- Issue date Sep 28, 1993
- Robert M. Johnstone
- G09 - EDUCATION CRYPTOGRAPHY DISPLAY ADVERTISING SEALS
Information Patent Grant
Female electrical connector
- Patent number D314751
- Issue date Feb 19, 1991
- Dual-Lite, Inc.
- Joseph S. Wegrzyn
- D13 - Equipment for production, distribution, or transformation of energy
Information Patent Grant
Male electrical connector
- Patent number D314750
- Issue date Feb 19, 1991
- Dual-Lite, Inc.
- Joseph S. Wegrzyn
- D13 - Equipment for production, distribution, or transformation of energy
Information Patent Grant
Connector assembly for plug-in energization and battery activation...
- Patent number 4,885,474
- Issue date Dec 5, 1989
- Dual-Lite, Inc.
- Robert M. Johnstone
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information Patent Grant
Opaque sign plaque with dual reflector illumination
- Patent number 4,561,203
- Issue date Dec 31, 1985
- Dual-Lite Manufacturing
- Robert D. MacDonald
- G09 - EDUCATION CRYPTOGRAPHY DISPLAY ADVERTISING SEALS

Robert M. Johnstone

Person

Patents Grantslast 30 patents

Apparatus and method of indirectly illuminating a sign

Exit sign with removable emergency power pack module

Canopy mounting device for exit signs and the like

Indirectly illuminated sign

Canopy mounting device for exit signs and the like

Indirectly illuminated sign

Canopy mounting device for exit signs and the like

Sign apparatus with insertible directional arrow

Female electrical connector

Male electrical connector

Connector assembly for plug-in energization and battery activation...

Opaque sign plaque with dual reflector illumination