US Patent No: 4,443,835

Number of patents in Portfolio can not be more than 2000

Apparatus for creating an even illumination of a plurality of title blocks

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Importance

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Abstract

A diaphragm having a plurality of apertures each associated with a title block on the front panel of an indicator unit is provided to cause the various title blocks to be illuminated evenly from a light source positioned behind the diaphragm. The size, number and shape of the apertures is so chosen that all of the title blocks are equally illuminated regardless of their size and regardless of their distance to the light source. Indirect light is used to prevent the formation of shadows and light spots on the title blocks.

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First Claim

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Patent Owner(s)

Patent OwnerAddressTotal Patents
ROBERT BOSCH GMBHSTUTTGART14694

International Classification(s)

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  • [Patents Count]

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Brautigam, Rolf Markt, DE 2 22
Wesemeyer, Jurgen Nurnberg, DE 16 259
Zobl, Hartmut Furth/Bay, DE 6 128

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Patent Citation Ranking

Forward Cites

Patent Info (Count) # Cites Year
 
HUBBELL INCORPORATED (5)
5,459,955 Lighting device used in an exit sign 27 1993
5,526,236 Lighting device used in an exit sign 52 1994
D406863 Panel for an exit sign having a curved face 8 1996
D402316 Sign having a curved face 8 1996
D406279 Combination emergency lighting device and exit sign 11 1997
 
DUAL-LITE INC. (2)
5,410,453 Lighting device used in an exit sign 88 1993
5,539,623 Lighting device used in an exit sign 41 1994
 
LISA DRAXLMAIER GMBH (2)
6,652,128 Backlighting method for an automotive trim panel 42 2001
7,201,508 Backlighting method for an automotive trim panel 5 2003
 
MAYTAG CORPORATION (2)
5,660,452 Indicator light for an appliance 0 1995
5,698,826 Selective back lighting of appliance control panel 8 1996
 
DAI NIPPON INSATSU KABUSHIKI KAISHA (1)
4,739,459 Automatic range control method for an optical density/dot percentage measuring device 1 1987
 
DUAL-LITE MANUFACTURING, INC. (1)
5,018,290 Exit sign 52 1989
 
ELLUMINEERING, LLC (1)
7,748,148 Display sign adapted to be backlit by widely spaced light emitting diodes 0 2007
 
FIAT AUTO S.P.A. (1)
4,630,184 Motor vehicle lamp, and a light unit for motor vehicles incorporating such lamps 6 1985
 
FLEXTRONICS AUTOMOTIVE INC. (1)
7,828,470 Electronic indicator with backlighting 0 2005
 
FORD MOTOR COMPANY (1)
5,821,867 Transreflective instrument display 14 1995
 
MAGNADYNE CORPORATION (1)
4,812,814 Indicating light 42 1988
 
TRANSPACIFIC OPTICS LLC (1)
5,798,849 Multilevel light source device 8 1996
 
YAZAKI CORPORATION (1)
4,991,537 Indicator 13 1989