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US 3,944,418 AGranted
Microelectrophotographic method
AssigneeDennison Manufacturing Company
InventorDonald D. Sloan
Life of this patent
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AssigneeDennison Manufacturing Company
InventorDonald D. Sloan
Estimating the term…
Method and apparatus for microelectrophotographing originals by individually charging and exposing to the originals, through an exposure opening and a reducing lens, reduced size microelectrophotographic sheets, comprising an electrophotographic layer (made up of photoconductive particles embedded in an insulator binder) on a conductive base sheet, followed by individually toner developing the exposed microelectrophotographic sheets to form individual, reduced size (e.g. reduction of from 20 to 1 to 3 to 1), direct reading micropositives of the originals, a plurality of which may be removably mounted on a storage sheet for storing the information in a plurality of originals on a single storage sheet. In this way, instantly developed, individual, reduced size, positive microimages of single documents may be obtained one at a time in a single microimaging machine or unit.
A method of microelectrophotographing originals on individual microelectrophotographic sheets to produce a plurality of individual and separate microelectrophotographs, comprising charging each of said sheets, exposing each of said charged sheets to an original through an exposure opening and a reduction lens, and toner developing each of said exposed sheets to produce positive visible, reduced size microimages of said originals on said sheets, each of said microelectrophotographic sheets comprising an electrophotographic layer, containing photoconductive material and an insulator binder, on a conductive base sheet, (according to Claim 1), each of said microelectrophotographic sheets being removably adhered to a backing sheet by a pressure sensitive adhesive and said charging, exposure and developing steps being carried out by individually moving each of said microelectrophotographic sheets while adhered to said backing sheet past charging, exposing and developing stations, whereby positives are obtained directly from said originals in a single machine, the adhesive bond between said adhesive and said backing sheet being less than the adhesive bond between said adhesive and said microelectrophotographic sheet and less than the cohesive strength of said adhesive.
A method of making a storage sheet comprising providing a plurality of individual microelectrophotographic sheets removably adhered to a backing sheet, each of said microelectrophotographic sheets comprising electrophotographic layer containing photoconductive material and an insulator binder on a conductive sheet, charging each of said microelectrophotographic sheets, exposing each of said charged microelectrophotographic sheets to an original through an exposure opening and a reduction lens, toner developing each of said exposed microelectrophotographic sheets to produce a positive, visible, reduced size microimage of said original on said sheet, detaching said developed sheets from said backing sheet and adhering said developed sheets to a storage sheet.
Dependencies are inferred from the claim text.