Assignee: Western Litho Plate & Supply Co.

Location: St.Louis, MO
No. of patents: 24

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Number	Title	Issue Date
5934195	Apparatus for and method of exposing lithographic plates A conveyor conveys first and second plates to an exposure station. First and second laser imagers mounted at the exposure station above the support generate first and second laser beams adapted to sweep over the first and second plates, respectively. A me...	08/10/1999
5892574	Plate exposing apparatus and method Apparatus for subjecting photosensitive letterpress lithographic plates to a pre-exposure operation and then to a main exposure operation. The apparatus includes a support for supporting a letterpress plate at a pre-exposure station, a pre-exposure system...	04/06/1999
5786127	Photosensitive element having an overcoat which increases photo-speed and is substantially impermeable to oxygen This invention relates to a novel photosensitive element comprising: a support having a surface; a photosensitive layer on the surface; and a transparent, protective coating on the photosensitive layer. The photosensitive layer comprises a composition of ...	07/28/1998
5701170	System for automatically exposing and labeling a plurality of lithographic plates A system for generating from unimaged plates a plurality of exposed lithographic plates to be provided to a press for use in printing. The system is for use with a film exposer for exposing a negative which includes an identifying code identifying the neg...	12/23/1997
5684571	Apparatus for and method of exposing photosensitized plates Apparatus for exposing photosensitized plates to light through films. The apparatus has an infeed end, an outfeed end forward of the infeed end, opposite sides, an exposure station forward of the infeed end at which a plate is exposed to light through a f...	11/04/1997
5542002	Method and apparatus for automatically inspecting a lithographic plate and reading its folio Lithographic plates have an identifying folio and an image thereon. The image corresponds to a print image to be printed on sheet material such as newspaper stock. An image camera optically examines the identifying folios of each of the lithographic plate...	07/30/1996
5502993	Method of and apparatus for punching and bending a lithographic plate Apparatus for bending a lithographic plate having an image thereon, comprising an inspection system for (a) inspecting a plate held on a table at an inspection station, (b) determining the extent to which the plate needs to be adjusted relative to a prede...	04/02/1996
5454247	Method of and apparatus for punching and bending a lithographic plate Method of and apparatus for punching and bending a lithographic plate to match a particular press so that when the plate is subsequently mounted on that particular press, it is oriented to print a properly positioned image on a print surface. The method c...	10/03/1995
5369468	Photographic printing apparatus and method Automated apparatus and method for exposing lithographic plates to light through films and masks. The method involves placing a plate, film and mask at an exposure station in superposed relation to one another with the film overlying the plate and the mas...	11/29/1994
5347341	Photographic printing apparatus Apparatus for exposing photosensitized plates to light through films, having a window movable up and down at an exposure station adapted to grip a film after an exposure of a plate and to lift the film away from the plate, plates and films being fed in un...	09/13/1994
5193690	Method of and apparatus for automatically inspecting an exposed and bent lithographic plate A method of automatically inspecting an exposed and bent lithographic plate having an image thereon to determine whether the image is in proper registration relative to the plate. The plate has front, rear, and opposite side edges. The method comprises th...	03/16/1993
4951089	Photographic printing apparatus Apparatus for selectively exposing photosensitized plates to light through films operable selectively in a first mode for exposing plates of single newspaper page size to light through films of such size, and in a second mode for exposing plates of double...	08/21/1990
4752283	Waste water cleaning system for use with apparatus for processing exposed lithographic plates A waste water cleaning system for use with apparatus for processing exposed lithographic plates, the processing apparatus receiving wash water for use in the processing. The cleaning system includes a centrifuge for removing contaminants from waste water ...	06/21/1988
4614425	Photographic printing method and apparatus A method of and apparatus for exposing boards which are photosensitive on both sides, for production of printed circuits on both sides, to light through films on both sides in which a lower film, a board, and an upper film in registered position on a ligh...	09/30/1986
4575235	Photographic printing apparatus and methods An apparatus for and method of exposing lithographic plates to light through films in which plates are brought into an exposure station for exposure alternately on first and second platens, each movable from a loading position outside the exposure station...	03/11/1986
4423955	Photographic printing apparatus Apparatus for exposing lithographic plates to light through a film, e.g. a negative, adapted for exposing one plate to light through a film or a plurality of plates to light through a film, having a first carriage with vacuum grippers for picking up a pla...	01/03/1984
4353647	Apparatus for exposing and conveying photosensitive plates Apparatus for exposing lithographic plates to light through a film, e.g. a negative, adapted for exposing a plurality of plates to light through the same film, having a conveyor with grippers for conveying a plate with a film thereon to an exposure statio...	10/12/1982
4334755	Apparatus and method for processing lithographic plates Apparatus for processing lithographic plates after they have been exposed and developed having a system for feeding plates forward one after another in a predetermined path with the exposed and developed face of the plate facing up, a heating system for h...	06/15/1982
4292396	Method for improving the press life of a lithographic image having an outer layer comprising an epoxy resin and article produced by method A method of increasing the strength, abrasion resistance, solvent resistance, and press life of a lithographic image comprising a layer of light-reacted light sensitive material and an outer layer comprising an epoxy resin overlying the light-reacted laye...	09/29/1981
4272605	Base plate and lithographic plate prepared by sensitization thereof A base plate adapted to be coated with a light-sensitive diazo resin, and a lithographic plate which may be prepared therefrom. The base plate includes a substrate comprising a metal support and having a water-wettable, hydrophilic surface. Over the subst...	06/09/1981
4272604	Base plate and lithographic plate prepared by sensitization thereof A base plate adapted to be coated with a light-sensitive diazo resin, and a lithographic plate which may be prepared therefrom. The base plate includes a substrate comprising a metal support and having a water-wettable, hydrophilic surface. Over the subst...	06/09/1981
4222656	Apparatus and method for processing exposed lithographic plates Apparatus for processing exposed lithographic plates in which an exposed plate is continuously fed forward with the exposed face of the plate facing up, developer is delivered onto the upper face of the plate by a nozzle which is traversed back and forth ...	09/16/1980
4198470	Base plate and lithographic plate prepared by sensitization thereof A base plate adapted to be coated with a light-sensitive diazo resin, and a lithographic plate which may be prepared therefrom. The base plate includes a substrate comprising a metal support and having a water-wettable, hydrophilic surface. Over the subst...	04/15/1980
3993684	Monomeric compounds Photosensitive homopolymers and substantially non-crosslinked copolymers containing the recurring unit: ##EQU1## R1 may be substituted or unsubstituted alkylene, aralkylene, alkoxyalkylene or aryloxyalkylene. R2 is a substituted...	11/23/1976

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Assignee: Western Litho Plate & Supply Co.