Patents by Inventor Robert M. Johnstone

Robert M. Johnstone has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 6026602
    Abstract: An internally illuminated sign having indirect illumination provided by light emitting diodes (LED). A plurality of LED's are mounted on a printed circuit board (PC board) and mounted within the sign. The PC board is offset to a side of the sign housing with the somewhat directional LED light source directed toward a reflector. The reflector is angled to convert the generally narrow directional light source of an LED into a substantially even, diffused and non-uniform light distribution pattern.
    Type: Grant
    Filed: November 12, 1997
    Date of Patent: February 22, 2000
    Assignee: Prolume, Inc.
    Inventors: Daniel J. Grondal, Robert M. Johnstone
  • Patent number: 5768814
    Abstract: In an exit sign, an insertable battery pack module is designed to fit in the lower portion of the exit sign housing. This battery pack module incorporates a pair of lamps as well as a battery, battery charger and transfer circuitry. The module incorporates a pair of reflective surfaces so that light from lamp filaments tangentially hit at least a portion of the exit sign stenciled area along the bottom portion of the letters forming the word EXIT. If an exit sign is only to have utility AC power, then the module need not be installed within the exit sign. In this configuration, the bottom portion of the exit sign can incorporate a slidable panel which is removed if the battery pack module is later inserted. The battery pack module incorporates the indicator light and test button which then would show through the area where the panel formerly resided.
    Type: Grant
    Filed: July 26, 1993
    Date of Patent: June 23, 1998
    Assignee: GSEG LLC
    Inventors: Edward P. Kozek, Robert M. Johnstone
  • Patent number: 5727867
    Abstract: In an exit sign, a canopy bracket has a pair of resilient spring fingers which are inserted through a central circular opening of a mounting plate mounted to a standard electrical box located in a wall or ceiling. The spring fingers temporarily secure the canopy bracket to the mounting plate this allowing an electrician to easily align and secure screws to the mounting plate, thereby greatly facilitating installation. The wires from the electrical box are extended through mounting plate and the canopy prior to securing the canopy to the mounting plate. Once secured, the user simply fits a hub portion of the canopy bracket telescopically within an opening with the exit sign housing. Spring capture barb members of the hub engage the housing to fixedly secure the exit sign to the wall or ceiling. Then the user connects the wires extending from the canopy bracket to those in the exit sign.
    Type: Grant
    Filed: September 8, 1995
    Date of Patent: March 17, 1998
    Assignee: GSEG LLC
    Inventor: Robert M. Johnstone
  • Patent number: 5542201
    Abstract: An internally illuminated sign having indirect illumination provided by light emitting diodes (LED). A plurality of LED's are mounted on a printed circuit board (PC board) and mounted within the sign. The PC board is offset to a side of the sign housing with the somewhat directional LED light source directed toward a reflector. The reflector is angled to convert the generally narrow directional light source of an LED into a substantially even, diffused and non-uniform light distribution pattern.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: August 6, 1996
    Assignee: Prolume, Inc.
    Inventors: Daniel J. Grondal, Robert M. Johnstone
  • Patent number: 5461550
    Abstract: In an exit sign, a canopy bracket has a pair of resilient spring fingers which are inserted through a central circular opening of a mounting plate mounted to a standard electrical box located in a wall or ceiling. The spring fingers temporarily secure the canopy bracket to the mounting plate thus allowing an electrician to easily align and secure screws to the mounting plate, thereby greatly facilitating installation. The wires from the electrical box are extended through mounting plate and the canopy prior to securing the canopy to the mounting plate. Once secured, the user simply fits a hub portion of the canopy bracket telescopically within an opening with the exit sign housing. Spring capture barb members of the hub engage the housing to fixedly secure the exit sign to the wall or ceiling. Then the user connects the wires extending from the canopy bracket to those in the exit sign.
    Type: Grant
    Filed: December 17, 1993
    Date of Patent: October 24, 1995
    Assignee: Dual-Lite Manufacturing, Inc.
    Inventor: Robert M. Johnstone
  • Patent number: 5428912
    Abstract: An internally illuminated sign having indirect illumination provided by light emitting diodes (LED). A plurality of LED's are mounted on a printed circuit board (PC board) and mounted within the sign. The PC board is offset to a side of the sign housing with the somewhat directional LED light source directed toward a reflector. The reflector is angled to convert the generally narrow directional light source of an LED into a substantially even, diffused and non-uniform light distribution pattern.
    Type: Grant
    Filed: August 5, 1993
    Date of Patent: July 4, 1995
    Assignee: Prolume Incorporated
    Inventors: Daniel J. Grondal, Robert M. Johnstone
  • Patent number: 5272605
    Abstract: In an exit sign, a canopy bracket has a pair of resilient spring fingers which are inserted through a central circular opening of a mounting plate mounted to a standard electrical box located in a wall or ceiling. The spring fingers temporarily secure the canopy bracket to the mounting plate thus allowing an electrician to easily align and secure screws to the mounting plate, thereby greatly facilitating installation. The wires from the electrical box are extended through mounting plate and the canopy prior to securing the canopy to the mounting plate. Once secured, the user simply fits a hub portion of the canopy bracket telescopically within an opening with the exit sign housing. Spring capture barb members of the hub engage the housing to fixedly secure the exit sign to the wall or ceiling. Then the user connects the wires extending from the canopy bracket to those in the exit sign.
    Type: Grant
    Filed: July 27, 1992
    Date of Patent: December 21, 1993
    Assignee: Dual-Lite Manufacturing, Inc.
    Inventor: Robert M. Johnstone
  • Patent number: 5247756
    Abstract: A removable and reinsertible arrow cover for a sign stencil. The cover is equipped with an edge bevel, a tongue and an edge snap rail positioned remotely of the tongue to facilitate snap action insertion and removal as well as a snug, flush fit which provides a closed seal to the passage of light with an arrow shaped void in the stencil.
    Type: Grant
    Filed: September 17, 1992
    Date of Patent: September 28, 1993
    Inventor: Robert M. Johnstone
  • Patent number: 4885474
    Abstract: An emergency lighting fixture, for plug-in installation in a wall connector mounted protruding from a fixed wall plate, has a back plate secured to its wall-engaging face. The back plate and the wall plate are provided with interfitting flanges and a pivoted latch secures the plates together in facing juxtaposed engagement. A mating multi-prong plug and socket connects A.C. line power from the wall connector to internal circuitry in the lighting fixture for lighting a lamp, for charging a rechargeable internal battery and for operating a transfer circuit to deliver battery power in the event of line power failure. The conductor from one terminal of the battery is connected to said circuitry by two prong-and-socket pairs, in the multi-prong plug and socket, which are connected by a permanent jumper conductor in the wall connector, affording battery isolation in the lighting fixture until its plug-in installation in the wall connector is completed.
    Type: Grant
    Filed: March 15, 1989
    Date of Patent: December 5, 1989
    Assignee: Dual Lite, Inc.
    Inventors: Robert M. Johnstone, Joseph S. Wegrzyn
  • Patent number: 4561203
    Abstract: An illuminated sign with an opaque sign plaque employs a light source overlying the sign plaque embraced by a concave downward facing reflector, and a flat lower reflector underlying the sign plaque, providing both direct and reflected illumination over the face of the sign plaque. In its preferred form, the concave reflector is compoundly curved over the ends of the sign plaque and the flat lower reflector is tilted toward the sign plaque.
    Type: Grant
    Filed: August 4, 1983
    Date of Patent: December 31, 1985
    Assignee: Dual-Lite Manufacturing
    Inventors: Robert D. MacDonald, Jr., William A. Luca, Robert M. Johnstone
  • Patent number: D314750
    Type: Grant
    Filed: December 7, 1988
    Date of Patent: February 19, 1991
    Assignee: Dual-Lite, Inc.
    Inventors: Joseph S. Wegrzyn, Robert M. Johnstone
  • Patent number: D314751
    Type: Grant
    Filed: December 7, 1988
    Date of Patent: February 19, 1991
    Assignee: Dual-Lite, Inc.
    Inventors: Joseph S. Wegrzyn, Robert M. Johnstone